There's a bunch of power in LT's

[NoSlo5.0]

Finally got around to installing some ceramic coated LT's on the car and a matching off road X pipe in place of MAC shorties and a Bassani catted X. Holy friggin cow what a difference! I saw a magazine article where they dyno tested a bunch of different LT's on a stout motor and the 3" collector made a whopping extra 30 or 40 peak HP over ball and socket designs. I gotta say, I'm a believer. evidently, my exhaust has been a bottleneck for some time. I can't wait to see where it all falls out after I retune for 13.1:1 a/f ratio.

Bottom line Longtubes kick ass and well worth the install headaches. Might have to hit a dyno in St. Loius next month...

[Aerosi665]

Awesome stuff, I wouldnt throw LT's on my stock motor, but if I ever get around to buying those VT stage 2 cams I'll definatly invest in some.

[Joe Friday]

long tubes are the win. I just had them put on my GT and have no t regretted it

[Aerosi665]

Do you have extensive mods joe? At what point do the LT's really become beneficial?

[Joe Friday]

day 1.
My mods arn't extensive. I have a CAI (worthless) Polished and ported plenum. Thats about it for my engine mods. Long tubes are going to make more power as soon as you put them on. But they are a supporting mod, so anything else you do to the engine, IE Cams, Blower, ECT will make that much more power because of the long tubes.

[NoSlo5.0]

I swear they are quieter at part throttle and idle rpm even with an off road pipe over shorties and high flow cats. Any car would benefit as they are more efficient at scavenging exhaust than shortie designs. The amount of benefit depends on the size of the bottleneck. On my car, the exhaust was a bottleneck and it definitely showed with the new setup.

Kinda like a Tb on a 347, if you have all the supporting hardware for a 450hp motor and run a 55mm Tb, then it seems miraculous that going to a 75mm Tb could add 45hp, but when it is the single choke point, it is possible.

[Aerosi665]

I see. Thanks guy for the info. Im still stuck in the 6er mind frame "dont buy longtubes with a poweradder" :lol:

[Roushbabe]

day 1.
My mods arn't extensive. I have a CAI (worthless) Polished and ported plenum. Thats about it for my engine mods. Long tubes are going to make more power as soon as you put them on. But they are a supporting mod, so anything else you do to the engine, IE Cams, Blower, ECT will make that much more power because of the long tubes.

Couldn't agree more about the purpose for the LTs. Once I had mine installed, it felt like a whole different car. Not only did it sound mean, but i could also feel the extra added hp.

[Joe Friday]

I swear they are quieter at part throttle and idle rpm even with an off road pipe over shorties and high flow cats. Any car would benefit as they are more efficient at scavenging exhaust than shortie designs. The amount of benefit depends on the size of the bottleneck. On my car, the exhaust was a bottleneck and it definitely showed with the new setup.

Kinda like a Tb on a 347, if you have all the supporting hardware for a 450hp motor and run a 55mm Tb, then it seems miraculous that going to a 75mm Tb could add 45hp, but when it is the single choke point, it is possible.


I put dumps on my car after the mufflers and I am also surpised at how quiet it is. Of course when I'm on it it's louder, but on the highway it's quieter than my flowmaster exhaust i had before was. It's nice not to have highway drone again :D

[NoSlo5.0]

Should I go back to dumps? Only if I go back to that totally stealth look. V6 bumper covers and all. Running shorties through a catted X with dumps on my car (almost 12:1 cr) was bad enough to make ears ring and everything inside the car was buzzing and vibrating. I can hear my right rear bearing going bad now...:)

[Joe Friday]

lol my car vibrates a little bit at low rpm's in a high gear.but it's not really that bad for me. the dumps I have dump under the rear seats so most of the noise bouncesoff the trunk which has the sound muffleing material so it's not that bad for me. I love the sound of the flowmasters I had, but the highway drone killed me. out side of teh car i'm sure it's louder with the dumps, but inside its alot more pleasent

[MachGT]

Yeah, I may have to pick up a set of long tubes next year ;) I wonder what sort of difference they would make with the blower :)

[Aerosi665]

I love my magnapacks, they roar when I step on it but for some reason they are virtually silent in 5th gear so no drone, it's wonderful!