TAhawk69

I have a 2001 T/A a4 Firehawk. I was looking to do a reasonable price mod before christmas, and was wondering which mod is worth more power. I can have a custom 2.5" offroad y-pipe made for $200, already have o2 simms, or buy a maf translator. I am getting autotap for a christmas gift from a friend. So this could be a chance to tune. I still have stock manifolds and a cutout, how much should i expect from an offroad setup over my cutout. I also have lid & maf ends, but can't hear any pinging. which mod would benefit me more? thanks
marco

JNorris

iTrader: (4)

Unless you have a serious A/F problem the MAFT will not be worth much for a stock LS1. However, the Y pipe and no cats should be worth 5-10 rwhp. A friend of mine installed a MAC offroad pipe on a bolt on Z28 and gained ~2.5 tenths in the 1/4 He runs 12.3s. I have a MAFT and feel that I have gained nothing from it.
Go for the Y pipe.


John

Colonel

I'd gut the cats (about $30 worth of labor if you can't do it yourself.) A stock Y-pipe with gutted cats flows about as well as a 2.5" off-road Y-pipe, IMO.

I'd check my O2s and timing advance with Autotap or any other diagnostic scanner and buy a MAFT only if I found them to be off. If you don't have a diagnostic scanner or access to one then that might be a good first investment since a MAFT is only guesswork at best without one.

[ December 16, 2001: Message edited by: Colonel ]</p>