optimum exhast diameter
11-10-2010, 05:40 PM
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optimum exhast diameter
alright this christmas ill be buying a 2.4 mani, gmpp intake, and catback exhaust with a borla muffler. this will prob be as far as i go with the performance mods on my 08 l61. question is... what diameter should i get the catback, 2.25 inch or 2.5 inch. im thinking 2.25 since i wont be going f/i or adding any more bolt ons. what do u guys think?
11-10-2010, 07:37 PM
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2.25 would be just fine that way you wont lose too much low end. Also getting a intake is fine but you should also get a header and downpipe to go along with your exhaust and then finally finish off with a tune to get the maximum out of your mods.
11-12-2010, 04:12 PM
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yea im going with the 2.25, cant lose that low end and the 2.4 mani will already help the high. heads up, mandrelexhaustsystems.com just released their 2.25" kit for the cobalt, before now they only had 2.5"
11-12-2010, 04:43 PM
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