Currious about how much hp and more importantly torque there is to be gained by replacing the headers, y pipe, and exhaust?

Thanks for your input

 

not enough

 

some would say you never get enough gains no matter what you do. I'm leaning towards the thought that a ST would cost too much for the gains you get. True, you get tons of power, but for $7-8k installed... that's a little insane. I'd rather save that $$ for the next car.

Anyone care to comment with some numbers?

 

original post by me:

anywhere from 4whp - 12whp max. as far as torque figures, they range from +/- x - xx whp. you sacrifice low end, or you gain low end, and equal out the hp mid-top end. if you're trying to get whp a forced induction route achieves, forget about regular bolt ons.

updated for those that don't understand (slikster818, etc):

x/xx represents a value.

 

Thanks

 

WRONG!


First off my car is a 2003 "G" 6MT Coupe.

Mods:
TechnoSquare Crawford Reflash ECU
JWT PopCharger with "Z" Tube
Crawford V4 Plenum
Crawford HiFlow Cats
Crawford Headers (Aint that what this thread is about?)
Invidia G200 Dual Exhaust with "H" Pipe
Ground Wires

I ran my lightly modded coupe against a 2005 "G" Coupe 6MT on a DynoJet. So here's a guy with the new 298HP engine with the new cams, exhaust timing and bottom plenum. His only mods are a K&N Filter, "Z" Tube, and Ground Wires.

It was a warm night here in Tucson, about 94F, so horsepower levels are probably a bit low. Anyway '05 went on the Dyno for three runs, and he has a range of from 236 to 242 horspower. We then do a switch and add the Motordyne 3/8" Plenum Spacer. This is the first one I've seen, and it is a real stealth mod. We want to see if it works. Does three more pulls and he gets 248 horspower for each of his runs. So yes, to put all rumors aside. I saw exactly what he did. Six runs back to back. Plenums do work on the new engine.

Now for the exciting stuff, for me! The techs are just buttoning up my up may car, and we all want to see how the old modded engine, does against his new 2005 engine. So I start up my car, sounds great BTW, and drive it on to the Dyno. The modded ECU is reset, because the battery has been disconnected for and day and a half, so it has not relearned my aggressive driving habits. He drives my car on the Dyno, 3 pulls. Results all exactly the same. HP and Torque are corrected SAE. I've attached the results My Lines are Blue, his (the 2005 with the Motordyne) is Red. We peak about the same 248HP, but I peak 7-1/2 pound feet of torque higher then him. And if you look and the curves, I beat him in all the power ranges up to about 6300 RPM, where the new plenum runners and cam take me by about 1/2HP. I was hoping for a run of 250, but what the heck. See Graph attached.

My ride home was great. Those headers, are the most significant mod I've done. I can really feel the kick in the butt. I should have done this long ago.


Lou

 

^ you're WRONG!!!!!!! he said entire exhaust system. have you seen your mod list???????? also, remember how the '03/'04's have more torque figures than the '05 +. keep in mind low end is sacrificed for high end.

 

Lowrider, do you think you would get significant gains in the '05 as well with new headers?

 

majority of times, you will make gains from mods. you'll sacrifice low-mid end thats all. the increase in hp usually occurs up top.

 

wat the **** did you just say? are you a infiniti tech?

 

what don't you understand?? xx = represents a value. ever heard of school?

 

Ummm...i only had two pulls and this one's the best out of the two. I just bought the car, and these are the following mods done. Start counting, it's a long list......

1. Stillen Cat-back exhaust
2. JWT Pop Charger

I know the torque is hard to read so i wrote it. It's at 235 ft./lbs.

Not bad considering two mods and comparing to homeboy up above.

I'll post up pics after i throw on the plenum and alphawerks headers

 

ROFLMAOOOOOOOOOOOOOOOO!!!! HAHAHA nice one sen!!!

"ever heard of school?"!!! hahahahahahahah

 

ever heard of keeping it simple.

 

From all that I've heard the RevUp engine is very responsive to Bolt On Mods. So, IMO, the answer would be a definite YES! Since the RevUp, breaths better anyway, thanks to the new exhaust cams, headers should do more for the new motor, than they did for me. However, get the BEST, get CRAWFORD. And - Don't forget the Hi-Flow Cats.

Lou