I would guess maybe 15-18 fwhp with the h-pipe...I don't think they are that far off with that claim.
Now with the chip, I would expect like 7-15 fwhp. Although it will make ur car run much better (and help your ET), I don't think it could give you that much power. Of course, I don't have a chip, so I couldn't really tell you for sure
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I say stick with the sport springs unless you want to start auto-crossing. The sport springs will make ur ride pretty stiff.
Just my $.02.
Thanks,
DoranW