mhotrodscooter

iTrader: (13)

I found out a couple weeks ago, how much my exhaust was holding me back.. Now I wonder if my OBX's or 2.. Guess I don't know how for I can go with them.. I'm looking for 400rwhp, the calculator says I'm close. So how much is everyone else making through OBX's? Before I drop a grand on some ARH's..

trever1t

iTrader: (14)

really?

mhotrodscooter

iTrader: (13)

Really what?

trever1t

iTrader: (14)

if i understand you correctly you're asking if one set of long tube headers is more efficient than another for a 400hp. application? I can't see how you're being held back?

I'm doing just fine with an old used welded up set of tube

GMCtrk

iTrader: (27)

And your setup relates to his how? Superchargers don't gain much, if anything from longtubes.

IIRC, HirdleJ's 6.0 was held back by the OBX headers and he now has 1 7/8". I have 1 7/8s but I'm not sure how much they help, if anything over 1 3/4 on a h/c 6.0. I think it really comes down to how much you are willing to spend.

mhotrodscooter

iTrader: (13)

Well ObX's has 2.5 collectors, I'm sure you know that.. I do plan on spraying, so I wonder if the OBX's will be enough.. If someone is making big power with them, I'll keep them.

mhotrodscooter

iTrader: (13)

Was it the the tube size or the collector size? If seen a thread somewhere on a s/c vette, were tube sizes made no difference in hp

Bigschwerm

iTrader: (26)

I have asked the same question before because I am about to do P/P 762 heads custom ground cam and TBSS intake on my 5.3l...and the answers i got were the collector size might be a hindrance... So i am going modify the y pipe to run 2.5" true duals and if thats doesnt get me 400rwhp i have a set of used LPP long tubes with 3" collectors i can get pretty cheap.

Hope that helps...Good luck with your build!

Mangled03gmc

iTrader: (95)

Your are more then good with that set up. Guys have been in the 11's no prob with 2.5 collectors and small primaries..

GMCtrk

iTrader: (27)

Not N/A they haven't.