Header fitment question....
12-08-2001, 05:08 PM
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Header fitment question....
Hey guys! Can anyone confirm if my US Mugen 4-2-1 header will or will not bolt up to a 99 Civic SI.... Thanks so much guys!!!!!
12-09-2001, 01:18 PM
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Re: Header fitment question.... (00 Type R Chick)
it will, but the cat-converter will need to be changed. because itr has a 2.5 inch collector and Si's have 2.25in. simply get a Carsound cat from http://www.rollhard.com. mugen header will be sweet on an Si 
12-09-2001, 01:41 PM
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Re: Header fitment question.... (ToneyTigre)
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