decat

45

Asked by Oct 27, 2008 at 07:15 PM about the 1998 BMW 3 Series 323i Convertible RWD

Question type: Car Customization

what kind of difference would taking out my cat & replacing it with a decat pipe,what increase in power would i gain if any

3 Answers

5,035

Theres a lot of people saying you will gain a ton of power from decating ur car really it wont make you enough horse power for the ticket you could get. If you really want more power out of ur exhaust. Get a header system with a free flow exhaust. If you dont belive me then read this, http://www.uucmotorwerks.com/ its under tech tips.

95

I second it. Unless you're running race specs, I see no need whatsoever to decat a street car. If you do have an old exhaust system I would recommend getting a newer free-flow cat though. Converter technology has come a long way in the past few years, and you can have an emissions friendly exhaust without losing any power. Also seeing that you have a 323i, I'd look into removing the restrictions that BMW placed on that engine. I'd look at doing an M50 manifold conversion ( http://www.m50manifold.com ) which should get you a decent amount of power by removing intake restrictions. The stock manifold is undersized on purpose from the factory. I'd also look at your stock exhaust system, you'll probably get a decent amount of power out of it by even replacing it with a used M3 exhaust.

170

The car was desinged to be used with a cat, esp. BMW's. taking out the cat probably will not give a noticeable increase, it could actually decrease power.

Your Answer

3 Series

Looking for a Used 3 Series in your area?

CarGurus has 32,432 nationwide 3 Series listings starting at $995.

ZIP:

BMW 3 Series Experts

  • #1
    Tom Demyan
    Reputation
    5,550
  • #2
    Robert Charlson
    Reputation
    1,770
  • #3
    Matt Mankinen
    Reputation
    1,360
View All

Related Models For Sale

Used BMW 5 Series
395 Great Deals out of 16,361 listings starting at $900
Used BMW M3
12 Great Deals out of 1,668 listings starting at $6,995
Used Mercedes-Benz C-Class
668 Great Deals out of 25,818 listings starting at $1,488
Used Audi A4
215 Great Deals out of 12,607 listings starting at $1,000
Used Ford Mustang
270 Great Deals out of 37,082 listings starting at $2,150
Used Honda Accord
424 Great Deals out of 101,059 listings starting at $1,200
Used BMW 7 Series
114 Great Deals out of 4,855 listings starting at $3,950
Used Mercedes-Benz E-Class
396 Great Deals out of 19,984 listings starting at $1,850
Used Chevrolet Camaro
224 Great Deals out of 28,923 listings starting at $3,900

Used Cars For Sale

2018 BMW 3 Series For Sale
74 Great Deals out of 8,522 listings starting at $27,976
2017 BMW 3 Series For Sale
63 Great Deals out of 2,177 listings starting at $22,996
2016 BMW 3 Series For Sale
14 Great Deals out of 945 listings starting at $15,350
2015 BMW 3 Series For Sale
179 Great Deals out of 4,897 listings starting at $12,498
2014 BMW 3 Series For Sale
143 Great Deals out of 2,563 listings starting at $9,995

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.