cat or no cat

165

Asked by Feb 18, 2009 at 11:15 PM about the 1991 Chevrolet Camaro

Question type: Car Customization

i have a 1991 camaro rs 305 with a flowmaster muffler and i am thinking about removing the catyletic converter for a little more sound. what do you guys think?

11 Answers

45

Less restriction more flow=more horse power and better sound....buuuuuut,only if you are willing to pay the fine if ya get caught bro

7,885

ditch the stock cat and spend a little extra money on a high flow dynomax cat. they are around $300-$400 which i know sounds like a lot but they will keep your car street legal and they sound great too. i had an 87 without a cat because i thought it might be the way to go but when i got my 89 i went with a full dynomax exhaust including cat and it sounded much better than my 87 with just a muffler(flowmaster)

165

thanks for the info, but i indiana where i live, the cops are only concerned with the car being to loud. there are no emissions testing here. i was just thinking about removing the cat and putting a test pipe in its place, i have heard other camaros with this done and it sounds amazing. also, i have a small exhaust leak in front of the cat due to shotty welding.

7,885

yeah i understand there is no emission testing but if some cop is being a prick one day and decides to check your exhaust cause he notices that its louder than stock and there is no cat its a big fine. i understand if you dont go with the cat though as i did it once also.

35

if you want to work around it you could just hollow out ur cat. so if they do look under your car there will be a cat there, but its just hollow. same as taking it out but the look of it there =)

165

haha, i like that idea, but if i take it off i will probably sell it. Cats are going for big bucks right now, especially the older ones, they have platinum in them.

35

yea good point but if u hollow it out you can still sell the stuff inside from some money... may get more with it all together... and if you about it you can save your self a big fine if you get pulled over and dont have a cat. things to think about.

ditch the cat..if they dont do emissions or state inspections where you live you dont have to worry about it

7,885

dont forget that with too little of back pressure from the exhaust that your exhaust valves will also burn up and you will lose some low end power. remember im the one who went without a cat and then had a high performance one on a full system and i suggest the full system with a cat instead of without

75

Along with what Chase is saying, you should remember that if you reduce back pressure too much you will actually be removing good air and fuel out of the combustion chamber which could result in detonation when pushed. Engines with cats are usually camed to take advantage of the cat and allow for as much exhaust removal as possible with the cat in place. I would recommend getting a hig flow cat, that way you have a faster flowing exhaust yet retain enough backpressure to reduce/eliminate detonation.

55

bad for the flow thorugh and you may not ever pass inspection again lol

Your Answer

Camaro

Looking for a Used Camaro in your area?

CarGurus has 31,149 nationwide Camaro listings starting at $2,495.

ZIP:

Chevrolet Camaro Experts

  • #1
    dandyoun
    Reputation
    1,760
  • #2
    carGrrl
    Reputation
    1,220
  • #3
    Tom Demyan
    Reputation
    1,140
View All

Related Models For Sale

Used Ford Mustang
457 Great Deals out of 42,836 listings starting at $1,488
Used Chevrolet Corvette
180 Great Deals out of 16,275 listings starting at $3,000
Used Ford F-150
3,206 Great Deals out of 226,376 listings starting at $1,250
Used BMW 3 Series
1,061 Great Deals out of 33,091 listings starting at $1,428
Used Jeep Wrangler
450 Great Deals out of 20,129 listings starting at $2,500
Used GMC Sierra 1500
1,228 Great Deals out of 63,094 listings starting at $1,200

Used Cars For Sale

2018 Chevrolet Camaro For Sale
10,645 listings starting at $19,486
2017 Chevrolet Camaro For Sale
118 Great Deals out of 7,942 listings starting at $17,900
2016 Chevrolet Camaro For Sale
37 Great Deals out of 1,220 listings starting at $16,991
2015 Chevrolet Camaro For Sale
120 Great Deals out of 2,595 listings starting at $11,995
2014 Chevrolet Camaro For Sale
68 Great Deals out of 2,179 listings starting at $10,000

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.