chrismcdaniel

iTrader: (14)

I recently emailed MAC performance about a set of starter tubes for my headers, and the technician that responded emailed me a said that true duals and x pipe will not increase horse power or torque at all, they say that our system is set up to be equal to a x pipe or h pipe with true duals. DOES ANY ONE HAVE ANY BEFORE AND AFTER DYNO SHEETS THEY CAN POST SO I CAN PROVE TO THEM THAT IT DOES. or are they right?

mac.

chrismcdaniel

iTrader: (14)

or if any one has any first hand experience they can tell me about it would br great. if all this set up is going to do is make it sound better, then i can spend the money else where

Cal

iTrader: (1)

I think most experts would agree there's no question that true duels are capable of flowing better than a single tube catback exhaust. How much power you gain would depend on what has been done to your engine.

chrismcdaniel

iTrader: (14)

i agree, i am just realy curious about the nembers i guess, i mean how much more power will a true dual system give you over a ory pipe and a good cat back

Turo

iTrader: (23)

try the search, ive read a couple of posts of people posting dyno graphs after switching from ypipe & catback to x-pipe with true-duals.

rspect

i wish i would have heard about this earlier. the jet-hot headers are in and the ture duels and x-pipe are going on this thursday.

Cal

iTrader: (1)

Like I said, that's going to depend on your motor. A totaly stock motor running through manifolds may not see any measurable gain at all, just a better exhaust tone. But if you have cam and heads, headers, blower, turbo or any of that stuff, it's going to make a significant difference.

killer01ws6

try reading this.....
http://www.ls1.com/forums/showthread...hreadid=390270

Cal

iTrader: (1)

That's a good thread, nice to see the dyno comparison. Looks like at least 5 hp gain over the entire rpm range, and close to 20 hp in some places. I think I see 3" duals in my future!

chrismcdaniel

iTrader: (14)

thanks for the info. guys , i think im going to get the 3in into 3 inch kit from dr. gas for $199.99 and two 12 inch dynomax bullita at 35 bucks a pop. and weld them my self. but that seems like a lot of money for 5 hp. but i hope the sound is worth it.

SSCamaro99_3

iTrader: (1)

If nothing else, the sound is worth it.

Black Sunshine/ 00SS

iTrader: (1)

There is is a great gain, even on a stock car, with the 3" out to the DR GAS X to bullets. I used that when the car ran the 11.49 on just bolt ons, and a little ol Vig 3200. It was loud on the car, but dont expect to talk on the phone, or hold a conversation with someone sitting right next to you.

Maybe mine was missing the insulation from under the stock carpet. A little weight reduction never hurt anyone.

Cal

iTrader: (1)

I did some calculations on the cross sectional area of different tubes, since flow is proportional to that. Flow is not proportional to diameter. Here's the results in order of flow potential:

Single 3.0" = 7.07 sq. inches
Single 3.5" = 9.62 sq. inches
dual 2.5" = 9.80 sq. inches
Single 4" = 12.56 sq. inches
dual 3.0" = 14.14 sq. inches
dual 3.5" = 19.24 sq. inches

I think a dual 3.0" is what I want!

Z06PSI

iTrader: (33)

Its what I have ......Good numbers and good for the spray.....

pontiac

iTrader: (4)

i am about to go to the true duels and bullets mac with no cat do yall think this will be good , sound good.

offaxis

iTrader: (19)

I dropped 1 tenth in the 1/4 over single with a open cutout.At the time i had stock heads and a tr220 cam running 11`s. worth a min of 10+ hp no problem.

SSEUL8R

I picked up 41hp and 36 ft. lbs. when I went from stock manifolds, stock y, cats, and hooker catback... to Pacesetter coated LT's, and true duals with x-pipe and dynomax bullets. I know headers couldnt make a 41 hp difference, so the true duals had to make up some of that. And my car isn't that loud at cruise speed, i had the tips turned down at a 45 degree instead of straight down.

jrp

iTrader: (16)

the real benefit of true duals is the gains under the curve. i got my duals sitting in my room waiting to go on

LS69TA

iTrader: (30)

I liked my 3" Hedman x-pipe, and it was only $100...My car had the turndowns at 45 degrees, and it still rattled everything that wasn't bolted down inside the car at highway cruising RPM, but smoothed out once you got it over about 2200 or so RPM..but you can't beat the sound..I had so many compliments and thumbs up. Especially from truckers on the interstate..

SouthFL.02.SS

Yes, as JRP states, the gains are not so dramatic in peak HP, but rather in the gains measured throughout the rev range. I suprisingly picked up lots of power at the low end w/ duals.