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#8: 10-13-2007, 04:56 PM
 
 Crucial Racing
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Title: Vendor III
Location: Bay Area, CA
Car: '98 LGT w/ EJ20 swap, JDM RA tranny, etc
Posts: 1,114
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Yeah, except that most catbacks (and 3" downpipes) neck down to a 2.5" donut gasket anyway. Might as well be 2.5 the whole time and save the turbulence going from 3" to 2.5 then back to 3"

Our downpipe will be ending in a 3" flat flange. Hopefully there are a few choices of LGT catbacks out there w/ 3" flat flanges also. No donut here. No 2.5" section once the piping steps up to 3"....

Jeremy