Quote:
Originally posted by robs2000gt:
I have 3.73 gears, 2 chamber flows, 100hp shot of nx. I was thinking of getting an xpipe. will it actually improve performance? I want to do some more mods to get me into the solid 12's. right now i am running high 12's real low 13's. I was also thinking of bumping up to 125hp or 150 shot, what do you guys think. i was also wondering why x pipes with cats are not legal in california, is it because of smog or noise? My flows are illegal because of Noise.
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Yeah, with NOS or a blower you want to reduce back preasure pretty much as much as possible. (Ummm, yeah, that actually makes sense
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But an X-pipe with straight though baffled (as aposed to chambered) mufflers work well. I have Dynomax Ultra-Flows with a Bassani X-pipe myself. But in short, opening the exhaulst will be worth while with a NOS'd car.
As far as the emissions testing. Around here they do a look and see if you have something that looks like a cat. In CA, I believe they do the OEM rule. Meaning its gotta be an OEM part or an approved aftermarket. The only approved aftermarket Mustang parts I know of are part of the GT40 program isn't any help at all here.
Its really stupid, because a Bassani catalitic x-pipe will typically do better then the OEM H-pipe on a sniffer test, but its still illegal. In catalogs there will always be an * and a foot note next to them.
In conclusion, NA, a X-pipe with cats is worth maybe 12 rwhp. With NOS somewhat more. An off-road pipe will work somewhat better. Also remember, its not that hard to swap the H (or X pipe) in and out for inspection once a year.