kane.s2k

The UR exhaust sounds very nice.

I'd double check everything because you should honestly be making about another 30whp at least, even if it is on the conservative side with a dyno that reads lower than most mustangs.

o'malley_808

bummp thread from the dead but anyone have any updated numbers?

Spoolin

I have the GT1 manifold and DP and am very close to 700 whp on e85 right now. I actually have the very first production GT1 manifold that Cody built on my car and it hasnt cracked or anything. I've had it since late 05 and did have it Jet Hot 2000 coated in and out after a few heat cycles. So, this may have helped it last this long.

SsamJang

I still have my original GT1 mani also with 3in DP. I've read reviews of other manifolds cracking but I haven't had any problems with mine.

The most recent tune was done by UMS in Tempe, AZ a few years ago when I lived out there. It was tuned on AZ 91oct and made 448rwhp. Would like to use e85 but not readily available

I want to hit at least 500rwhp on pump but need some guidance.. suggestions? Don't want to use race gas or meth... just good ole 91 pump

Currently with built motor 9:1, stock AP2 head, GT35R, RC1000, single Walboro...

Spoolin

^^You're at the limits of 91 octane fuel being able to supress detonation. To safely get more power, you'll have to step up to 93 octane, e85, Sonoco 100 no lead for like $4.00 a gallon or a cheap race fuel like leaded Turbo Blue or Renegade for around $5.50 a gallon.