Flowmasters

[Aurora40]

Originally Posted by Hib Halverson

snip

The Flowmaster catback uses 2.5" pipe and stock is 2.75, however, the decrease in restriction with the Flowmaster cat-back makes using it a net gain.

The Flowmaster resonator, is single in and two out. We modified it to accept a larger inlet.

Right, I mean an unmodified single inlet. I assumed it was bigger than 2.5". Is that the size where the single inlet hits the resonator?

[Hib Halverson]

Darn!
16hp is pretty impressive from just an exhaust.

Were the two pulls made on the same day. If not, is this data SAE-corrected or standard-corrected?

[Aurora40]

Originally Posted by Hib Halverson

Darn!
16hp is pretty impressive from just an exhaust.

I believe that's 26hp.

[blackjack]

i originally installed a borla cat-back system,2 1/2"...then i heard about the restrictions inside the pipes,apparently there to cut down on interior resonnance...so i decided to make my owm,with help from some friends..we installed 2 1/2" pipes from the cats,removed the resonator and put an x pipe in its place,and installed back the borla mufflers...we did not dynoed the car before or after,but the gain in power was really noticeable...the sound is deep and mellow,and i didnt notice any resonnance inside,at any rpm
blackjack
91-1735
4:10 , lucas injectors,fidanza flywheel(noisy)

[Hib Halverson]

Originally Posted by Aurora40

I believe that's 26hp.

My bad on that. Can't add late at night.

I was wondering if those two dyno pulls were done on the same day? If not, can you say if the data is either SAE-corrected or standard-corrected?

[Aurora40]

It's not my dyno run, though the labels for the Y-axis' both say "SAE corrected" on them.

[Hib Halverson]

Originally Posted by Aurora40

It's not my dyno run, though the labels for the Y-axis' both say "SAE corrected" on them.

26 hp at the wheels, SAE-corrected, from a stock engine after just an exhaust change is absolutely incredible.

[Demps]

Sorry for the delay. I have my kids for Christmas and we're on the go.

Hib, the car was totally stock. It was dyno'd about a week apart. The values were SAE corrected. Stock dynos were done six times and they never varied more than 2 hp. The modified (exhaust only) dynos were done six times and it gained about 2.5 hp per pull. After six we quit. I drove it straight from the muffler shop to the dyno. The temp varied slightly but I don't remember which way (1st to 2nd). The water temps were fairly controlled but it climbed as the day went.

Ted

[jonszr1]

if i can ask hib if he has given thought to that ultra flow-x . they say its an x pipe in a muffler . I always hear that an x pipe gives alot of resonance. I amnot that knowledgeable but i just got back from having 410s put in as well as ported inj and plenum as well as a tune on the car instead of just ordering a chip that got13 hpextra . Since I have a complete flowmaster system I am very interested if i could gget an extra 10-15 out of her .She is at 409.9 rwhp 373 tq now . But 425 out of a stk motor with the above mods would be would be a dream come true. please advise as to my best path. any advise is much apprieated

[Hib Halverson]

Originally Posted by jonszr1

if i can ask hib if he has given thought to that ultra flow-x . they say its an x pipe in a muffler . I always hear that an x pipe gives alot of resonance. I amnot that knowledgeable but i just got back from having 410s put in as well as ported inj and plenum as well as a tune on the car instead of just ordering a chip that got13 hpextra . Since I have a complete flowmaster system I am very interested if i could gget an extra 10-15 out of her .She is at 409.9 rwhp 373 tq now . But 425 out of a stk motor with the above mods would be would be a dream come true. please advise as to my best path. any advise is much apprieated

I want to make sure I understand the above because it's just as amazing as 26hp at the wheels from just an exhaust....are you saying your car, which currently has a stock exhaust, makes 409 at the wheels after porting the injector housings, porting the plenum and having a custom tune done?

If this is correct, may I ask what facility did the dynamometer tests and are the numbers SAE-corrected, standard-corrected or raw data?