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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 05-16-2005, 09:27 PM   #1 (permalink)
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I have a 318is and is wondering if anyone knows do they need to have a catilac convert and that resenator or can they be cut off I am not worried about smog laws cause here in wisconsin they don't check but I was wondering does it need those for back presure or will it actualy help it breath alot better?
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Old 05-16-2005, 09:34 PM   #2 (permalink)
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Quote:
Originally posted by crazy91318@May 16 2005, 10:27 PM
I have a 318is and is wondering if anyone knows do they need to have a catilac convert and that resenator or can they be cut off I am not worried about smog laws cause here in wisconsin they don't check but I was wondering does it need those for back presure or will it actualy help it breath alot better?
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Hack that sucker!!! I never did on my BMW (hopefully soon..) but I used to build VW GTI's and that was always one of this first things to go... You will see more high-end power... Just be sure to get everything lined up properly (are you going to hollow them and put back on, or are you going to fabricate something)
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Old 05-16-2005, 10:56 PM   #3 (permalink)
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I just planed to just go down to a buddies show and have him put some new exhaust from the header back to a muffler and thats it cause I know it realy won't cost me a whole lot but that was my big question about back presure cause I have heard some things about that and wasn't sure I still kind of new to this whole 4cyl thing lol.
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Old 05-17-2005, 10:11 AM   #4 (permalink)
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Quote:
Originally posted by crazy91318@May 16 2005, 11:56 PM
I just planed to just go down to a buddies show and have him put some new exhaust from the header back to a muffler and thats it cause I know it realy won't cost me a whole lot but that was my big question about back presure cause I have heard some things about that and wasn't sure I still kind of new to this whole 4cyl thing lol.
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I think that the back pressure will be fine as long as you run like a 2.25" pipe from header back, dont go too crazy with making the exhaust system too large, may risk loosing torque..
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Old 05-17-2005, 09:01 PM   #5 (permalink)
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K cool yeah I was just thinking on the same size pipe that is one the car just new and new muffler and no cat
Quote:
Originally posted by jze325i+May 17 2005, 10:11 AM--><div class='quotetop'>QUOTE(jze325i @ May 17 2005, 10:11 AM)</div><div class='quotemain'><!--QuoteBegin-crazy91318@May 16 2005, 11:56 PM
I just planed to just go down to a buddies show and have him put some new exhaust from the header back to a muffler and thats it cause I know it realy won't cost me a whole lot but that was my big question about back presure cause I have heard some things about that and wasn't sure I still kind of new to this whole 4cyl thing lol.
[snapback]345093[/snapback]
I think that the back pressure will be fine as long as you run like a 2.25" pipe from header back, dont go too crazy with making the exhaust system too large, may risk loosing torque..

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