silverstreak07

Does a stock 6.2 muffler flower better than my 2.75 stock 07 vortec max muffler????/IF I PUT 1 7/8 HEADERS LT ON WITH A FACTORY 3.5 6.2 EXHAUST OM MY SUPER CHARGED 2300 6.0 MAX WILL I GAIN 30 HORSE SEEING IM SUPERCHARGED,WILL I FEAL IT IN THE SEAT OF MY PANTS!!!ONE MORE QUESTION IS A EXTENED CAB SHORTBOX EXHAUST THE SAME AS A CREW CAB TRUCK I HEARD ITS THE SAME WILL IT USE SAME HANGERS THANKS GUYS

Vortec350ss

iTrader: (20)

You will gain at least 30 HP. Your gain should actually be significantly more if you re tune it for the headers and get a pulley to bring boost back to where it was pre headers. I would honestly expect 50+ on your set up from a swap like that. How much boost do you currently run?

01WS6/tamu

iTrader: (36)

The gain will come from the headers your stock vmax muff flows excellently but the 3.5 won't hurt since you are FI.

01WS6/tamu

iTrader: (36)

Turn the damm caps off please. It hurts to read the post.

TXSZ66AVLANCHE

iTrader: (7)

What size throttle body do you have? Call me crazy but I dont see a point on going bigger exhaust when the TB is still the stock size and first has to pull air through it.

07NNBSVMAX

Iirc they're at least 87mm but I thought I seen somewhere say they were 90 on the vmax. Correct me if I'm wrong. Ik my 07 max has a pretty big tb.

Atomic

iTrader: (42)

No...the TB is almost never a restriction, especially in a FI application.

silverstreak07

I have like 8psi, when u floor it but kinda goes around 7.2 7.8 psi.I have a ls9 cam also in my truck with ls7 lifters.I think these motors are 9.1 should i boost up the psi i drive it on weekends, kinda daily driver how much boost is safe, normal i love the extra power WHEN NEEDED i drive it sensible until i get a anxious ford on the side of me LOL.these have a 90mm tb

Lucille

Supersub would disagree and I think he has some pretty good testing to back him up at least on FI that sucks.

AKlowriderZ71

iTrader: (22)

I got some pretty good gains going to a larger throttle body as well.

But if the setup was a blow-thru, I would agree with Atomic.