Question about 1995 Chevrolet Caprice Classic

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Upgrading from stock exhaust to flow master cat back.....how much more preformance?

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You will gain a marginal performance gain from the aftermarket exhaust system. Maybe 8-10 rear wheel horsepower. The real benefits would be the better exhaust note, but of course, that's a personal preference.

Posted on Aug 06, 2010

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How much does it cost for the exhaust


Most after-market exhaust companies offer four types of components:
  1. Cat-back exhaust systems - anywhere from $300 to $1200 - The final cost will depend on steel thickness and type, as well as muffler quality.
  2. Axle-back exhaust systems - same as above
  3. High performance mufflers - $75-$300 - The quality of the muffler's materials inside, as well as the type of steel and thickness used, impact the final price.
  4. Exhaust system tips - $25-$150 per tip - Almost all cat-back or axle-back systems include a quality exhaust tip. However, if you're building your own system, you can purchase an exhaust tip to "dress up" your factory pipe.
The schematic below shows where the "cat" (a.k.a. catalytic converter) is in relation to the engine. While many companies sell high-performance catalytic converters, they are fairly expensive and usually don't restrict exhaust flow too much, so we're not going to worry about them here.
alt="Exhaust system schematic with notes">

This is a stylized schematic of an exhaust system.
On some vehicles, the muffler is mounted behind the rear axle. In this case, exhaust manufacturers sell "axle-back" systems. The only difference between a cat-back and an axle-back exhaust is the length of tubing - both include a new muffler. Therefore, there's not a lot of cost difference between the two. Both cat-back and axle-back systems include tubing, a muffler(s), and then all the hardware needed to mount the new system in place of the factory system. Most of the time, these systems use the factory exhaust hangers to make install as easy as possible.
Since a high-performance muffler is a part of a cat-back or axle-back exhaust system, buying a muffler by itself is usually the least expensive option in terms of parts cost. Keep in mind, however, that mufflers have higher labor costs. They're not necessarily less expensive by the time all the labor costs have been accounted for.
Muffler Only vs. Cat-back or Axle-back The biggest advantage in purchasing a full cat-back or axle-back system is that install is really simple. Many of these systems can be installed at home with basic tools. Conversely, installing a muffler at home may not be so simple - cutting and welding may be required. What's more, some after market mufflers require significant re-routing of your stock exhaust tubing...and that can get expensive very quickly.
The other advantage in a full cat-back or axle-back system is that they are often tuned to your specific vehicle and the included muffler(s). All things being equal, a cat-back or axle-back system will perform slightly better than a muffler only.
Stainless Steel vs Aluminized or Galvanized Steel The main difference between a stainless steel exhaust system and an aluminized or galvanized system is durability. Stainless systems will last a lifetime due to their ability to resist corrosion, with 200 300 series stainless systems being more resistant than 300 200 series systems (only the difference is slight). Some manufacturers will try and convince you that one type of stainless system (200, 300, or 400) has better sound quality than another, but there's no evidence we're aware of to support these claims. In fact, stainless steel tends to be slightly thinner than aluminizied steel. If anything, an aluminized system may have better sound quality.
Having said that, the muffler itself is the biggest factor in sound. The steel used in the system isn't as important as some make it out to be (at least in terms of sound quality).
When it comes to choosing between stainless and aluminized systems, it's important to consider your local environment. If you live in an area where corrosion risks are high (such as cold-weather areas that use salt to de-ice roadways), stainless steel may be a reasonable upgrade because it will resist rust. On the other hand, if your local environment is dry and the corrosion risks are low, the only reason to buy a stainless system is for looks.
Exhaust Tips There are probably thousands of different exhaust system tips available. Generally speaking, you get what you pay for. Stainless steel tips are very resistant to corrosion, but they don't shine up as nicely as chrome. Also, stainless steel tips are more likely to "blue", or change color during use. Titanium is also a material used to make exhaust tips - it's incredibly corrosion resistant, but just like stainless it's prone to blue during use. If you like the blue coloring, titanium is probably your best choice. If you want the shiny look, chrome is the way to go. If you want a tip that you can shine up every once in a while - but that's also resistant to the elements - stainless is a smart choice.
Exhaust System Labor Costs If you purchase a cat-back or axle-back exhaust system, labor costs are often very low. These systems bolt-on and use the existing factory hangers. In fact, many performance shops will install a cat-back exhaust system free of charge if you purchase it directly from them.
If you decide you want to purchase a muffler only, you'll want to get an install estimate from your local exhaust shop BEFORE you buy that muffler. Sometimes, installation is very straightforward and the cost is as little as $100. Other times, fabrication is required and the cost can be as high as $300 (or more). If the installation requires a lot of fabrication, you may be better off buying a cat-back or axle-back system instead.

Sep 16, 2015 | Cars & Trucks

1 Answer

Check engine light was on with many codes, fixed all problems( all new exhaust, magnaflow cat system, flow master muffler, all o2 sensors were replaced, gave a tune up using MSD wires cap and rotor and e3...


new exhaust is to much for computer to figure out, since its flowing a lot more air , engine management cannot figure out fuel ratio hence the o2 sensor and knock sensor. u will have to install a performance chip or have computer re figured for new settings.

Apr 09, 2011 | 1996 Chevrolet Tahoe

1 Answer

I have a P0420 code happening on my kia.What does that mean?


Code P0420 is a code for Catalyst efficiency. The computer is seeing the post Catalytic converter o2 sensor having too much activity. The Cat. should be cleaning the exaust of Hc, co, and Nox. The post cat o2 will read the o2 content in the exhaust and if it moves up and down too much or to high and low, the computer interperates that as the cat not ridding the exhaust of it's pollutants. This indicates that the converter is unable to preform properly. The problem could be a bad cat, o2 sensor (Pre- and/or post cat)or o2 sensor wires, or an air fuel mixture problem that has caused the cat to fail. Many other engine operating system failures can cause the converter to not work properly
hope this helps

Apr 03, 2011 | 2002 Kia Spectra

1 Answer

Performance Exhaust Help... 1999 Wrangler 2.5l, manual trans. I recently installed a new trottle body spacer and cold air intake system to my Jeep. It's apparently taking in more air than the stock exhaust...


Cat back are nice and they all do the same thing, and that make noise. Start with the Cat back exhaust system of your choice, but to get the full potential of your intake and exhaust system. Your going to have to get your Wrangler's ECM tuned for intake and exhaust system. Your engine will only do so much within the parameter of the ECM's program, regardless of your intake and exhaust upgrades. Cherry bomb is economical in the price of an exhaust system and will do the same as the bigger boy's without any ECM tuning. http://www.cherrybomb.com/
Good luck and thank you for using Fixya

Mar 16, 2010 | 1999 Jeep Wrangler

1 Answer

Engine light codes 02-3151 and P0420


Code P0420 is a code for Catalyst efficiency. The computer is seeing the post Catalytic converter o2 sensor having too much activity. The Cat. should be cleaning the exaust of Hc, co, and Nox. The post cat o2 will read the o2 content in the exhaust and if it moves up and down too much or to high and low, the computer interperates that as the cat not ridding the exhaust of it's pollutants. This indicates that the converter is unable to preform properly. The problem could be a bad cat, o2 sensor (Pre- and/or post cat)or o2 sensor wires, or an air fuel mixture problem that has caused the cat to fail. Many other engine operating system failures can cause the converter to not work properly.

Sep 10, 2009 | 2000 Toyota Corolla

3 Answers

Horsepower increase


install a free flowing aftermarket air intake kit, like one from K&N corp.

Mar 27, 2009 | 2004 Nissan 350Z

2 Answers

97 Jeep 4.0L is losing power driving down the road - manual


Yes, it is possible that the exhaust is plugged, and more specifically, it could be at the cat. converter. You would need someone to disconnect the exhaust system where the header pipe connects to the exhaust manifold, then drive it. If it preforms good, check converter or muffler. I have seen both at fault.
Bill

Nov 20, 2008 | 1997 Jeep Wrangler

1 Answer

Catalytic converter


i replaced my cat with a high flow cat and flowmaster 40 series exhaust about 4 years ago now. good set up on my 2.2L 4cyl 5spd. sounds excellent. the only problem, since it is a high flow cat and free flowing exhaust, there is little if any back pressure, and so i really dont have that much torque anymore. it actually made my truck slower on the bottom end. not that the 2.2L is a speed demon. lol. you could probably get away with a test pipe that is still the same size as the stock pipe and it will sound gread. as far as gas mileage, i doubt it will do anything to help. my exhaust didnt help my gas mileage any. the only thing ive noticed that got me more mileage is replacing the stock air filter with a drop in K&N filter. i got about 5 more miles a gallon just by doing that. good luck.

Jul 07, 2008 | 1994 Chevrolet S-10

1 Answer

Exhaust


Good Day,

Most aftermarket exhaust systems are cat-back. You defiantly need to keep the cat to comply with local emsisions regualtions. However you can remove the mufflers and replace them with high flow mufflers or resonators. Try to replace them with something not too loud so you are in accordance with noise laws in your area. I have a 2000 s10 with no mufflers, just a cat then a y-pipe to make it dual with two resonators coming straight out the back, I live in the states and made sure this sytem was 50 state street legal before I purchased it. I suggest you do the same to avoid harrasment by the police.

Good Luck

Hope this helps.

Jun 30, 2008 | 2005 Mazda RX-8

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