?? about HP Increase?

Hey guys, My 03 Mustang GT has a Mac cold air Intake, Long tube catted X-pipe, and flowmaster 40series muffler inserts.

I just ordered BBk long tube headers, off-road H-pipe, and the full cat back flowmaster 40series exhaust.

The Mustang currently has 242RWHP, how much would it increase to with this upgrade?? any help is appreciated! thanks in advance.

Chris, :nos: <--wish they had a ZEX bottle!! lol. I also got a 75shot!

I laid down 266.8 w/ those mods plus the TB and plenum combo, but I have a auto. Will be more with a stick 6-10 hp.

I had 264.5 with almost the same. I had under drives and a diablo tuner with accufab t/b and Pleanum. Hope it helps. Honestly if your hoping for big increases you will be disappointed. Bolt ons just dont do it till ya get a power adder then they help. I found that out the hard way and spent thousands trying to be the baddest Stang around only to have a stock ass GT with a Supercharger pull on me. The 75 shot is fun but just not enough. I spray 125 shot with all my mods and trust me the list is long and it gives me roughly 150 extra HP. Save up and buy a supercharger and then do the smaller bolt ons as the money comes. I wish I had!!!!!!!!!!!!!

I agree.

IMHO, 250 or so with the new exhaust if your absolutely sure about the already 242.