DaveP- Bassini and Random Tech are both working on the bolt in off road pipes. Randoms x pipe will come with hi flow cats though. Still, as far as I know, no one has released anything yet as far as bolt in.
RG... exactly!! They will not be getting 25 RWHP without removing all the cats, and mufflers! Just a catback has shown less than 10HP... no matter who's setup. I have a custom built, dual Borla XR-1 Race Muffler system, and only gained about 5 RWHP. Without screwing around before the cat's you will not see 20+ RWHP!
2001 Z-06 White w/Mod Red
Solo 2 SS Class #39 www.sccaforums.com