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Discussion Starter · #1 ·
Will a downpipe with a high flow cat approximately equal the perf. gain of an "offroad" downpipe.

I don't have emissions testing to deal with but just wonder whether to buy the straight pipe or splurge and buy the high flow cat version.

458 Posts
I used the RT Hi-flo cat down-pipe and was still faster than one with a RMM off-road. Only difference in mods was mine had a FMIC and his was stock.
The hi-flo was way better than gutted stock cats.
Plus I'm a tree-hugger so I'm kinda partial to the clean running cars...
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