Straight Pipes Vs. Full After Market Exhaust

[Chris2kGT]

The bad press that Flowmaster gets is from the 3 chamber exhausts as it has so many baffles you create a ton of back pressure. The more free flowing the exhaust is the better.

 

[xxkazp3rxx]

The bad press that Flowmaster gets is from the 3 chamber exhausts as it has so many baffles you create a ton of back pressure. The more free flowing the exhaust is the better.

That's not always true though. If you aren't running the power, it doesn't help. Or else it would show up in dynos, which it doesn't all the time (i know i have tried).

The hp you gain from midpipe/catback on N/A cars is virtually unnoticeable, but you can definitely feel the loss of power when you have a leak or run straight pipes/open headers in an application that doesn't need it.

That being said sound wise you want to keep hpipes with chambered mufflers, and x pipes with the more free flowing mufflers. The horsepower doesn't really change - just the power curve. Hpipes you will see a increase in low end, vs a xpipe high end..

If you run open headers or straight pipe exhaust on a car with little power, you will not see much of a gain if any, and might even lose some. The restrictions actually help some of the smaller powered cars; which is why you only see the high power cars with dumps at the strip.


Btw, all of those magazine articles, and reports by the producer of the magazine or shops really aren't worth it. Almost all are bias in someway due to sponsorships. In the end all of your exhaust is going to be about the same power.. It's just a matter of which sound you prefer the most.

 

[PrjctLxEnvy]

lol with no price budget..... i cant say it enough.. KOOKS KOOKS KOOKS.......

 

[stangman1995gt]

I have always been a flowmaster fan, but I do like the sound of the SLP loud mouth II or the Borla.

 

[Jimmerz]

The bad press that Flowmaster gets is from the 3 chamber exhausts as it has so many baffles you create a ton of back pressure. The more free flowing the exhaust is the better.

then maybe ill take my mufflers off LOL.. probly wont be much louder than it already is

 

[Jimmerz]

I have always been a flowmaster fan, but I do like the sound of the SLP loud mouth II or the Borla.

me too but i like that raspy nascar sound anyway.. lol, when ya dump it to pass someone its like your car is screaming at the other car to get out of the way lol

 

[94Gt5.0]

Ok bitches , heres the test MM&FF did YEARS back. This will show you what power each kind of muffler made on the same car..

MUFFLER SHOOTOUT:

Results based on 5.0 Mustang Magazine December 2002 issue (page 55). Test car is a ’90 Coupe with 370 HP and 11 second potential. A number of 66 pulls were made to compile this information. Where does your muffler stack up?

The results in HP order:

1.Flowtech Warlock (open) 374.2 hp/ 333.1 tq
2.Bassani Real Street 373.7 hp/ 333.8 tq
3.Hooker Maxflow 373.5 hp/ 333 tq
4.Borla XS 373.3 hp/ 332.6 tq
5.Magnaflow 372.8 / 332.5 tq
6.MAC 372.3 hp / 331.5 tq
7.Flowtech Afterburner 372.3 hp/ 330.1 tq
8.Hooker Aerochamber 372.1 hp/ 330.4 tq
9.Bassani 372 hp/ 333.5 tq
10.Spintech 371.6 hp/ 332.2 tq
11.Edelbrock Performer RPM 370.9 hp / 331.3 tq
12.Borla XR1 370 hp/ 334 tq
13.Flowtech Terminator 369.5 hp / 331.3 tq
14.Dynomax Ultra Flo 369.4 / 333.2 tq
15.Flowmaster 369.4 hp / 331.8 tq
16.Flowtech Warlock 366.3 hp / 325.3 tq
17.No muffs 365.2 hp / 330.1 tq

Sound Off in Quietest to Loudest (Decibels):

1.Borla XS, 80db at idle, 90db at 2,000 rpm, 110db at WOT.
2.Hooker Maxflow, 80db at idle, 90db at 2,000 rpm, 120db at WOT.
3.Magnaflow, 82db at idle, 91 at 2,000 rpm, 114db at WOT.
4.Flowmaster, 82db at idle, 93 at 2,000 rpm, 115db at WOT.
5.Flowtech Warlock, 83db at idle, 92 at 2,000 rpm, 112db at WOT.
6.Dynomax UltraFlo, 83db at idle, 94 at 2,000 rpm, 113db at WOT.
7.Borla XR1, 83db at idle, 96db at 2,000 rpm, 118db at WOT.
8.Bassani Street, 83db at idle, 96db at 2,000 rpm, 120db at WOT.
9.Edelbrock RPM, 84db at idle, 93db at 2,000 rpm, 118db at WOT.
10.Bassani Real Street, 84db at idle, 96db at 2,000 rpm, MAX. (120+db).
11.Flowtech Afterburner, 86db at idle, 94db at 2,000 rpm, 115db at WOT.
12.Flowtech Terminator, 86db at idle, 94db at 2,000 rpm, 119db at WOT.
13.Hooker Aerochamber, 87db at idle, 94db at 2,000 rpm, 114db at WOT.
14.SpinTech, 87db at idle, 97db at 2,000 rpm, 116db at WOT.
15.MAC, 87db at idle, 98db at 2,000 rpm, 119db at WOT.
16.No Muffler, 91db at idle, 103db at 2,000 rpm, MAX. (120+db).

 

[Ghostly Echo]

I heard from a buddy of mine it had something to do with the carb motors and tuning. But after a little research I guess he was wrong and I look like a jackass.

BACK PRESSURE= BAD in every situation.

not hard to do

 

[Quick281]

some back pressure is a must! prochamber and mac catback FTW!

 

[Ghostly Echo]

some back pressure is a must! prochamber and mac catback FTW!

mac performance :-/ i need a sound clip for that

 

[xxkazp3rxx]

mac performance :-/ i need a sound clip for that

I don't like the prochamber and im a big mac fan.. I have the Mac o/r hpipe w/mac catback on my mach 1 and it sounds great (ask Monx).. not to loud, and very clean with a nice growl.. the prochamber has bit more growl to it, but is a more reserved sound imo...

On my 04' GT I had: Mac LTs, Mac Prochamber and flowmaster catback.. sounded good - just a little bit to low at idle for me personally.

 

[Quick281]

mac FTW

 

[04YellowGT]

Your car in some what stock form needs some back pressure. I'm running a catted SLP X-pipe and Spin Tech supper pro street cat back sounds great. If you run a o/r x with the pro streets its sounds good to.

 

[xxkazp3rxx]

Always remember the rule of thumb... Hpipe = chambered .... xpipe = non chambered

 

[04YellowGT]

I'm thinking about putting them on with an O/R X-pipe for now...and next year, put American Racing Longtubes with their O/R X-pipe...Will I lose any hp/tq with a freeflow muffler with that setup? I heard a freeflow muffler will yield more power then a chambered muffler...

fyi, I will NOT be putting FI on my stock motor...

Save your money and do it all at once, unless the American Racing system is a modular system like the SLP mid pipe you'll have to change the mid pipe again

 

[xxkazp3rxx]

Save your money and do it all at once, unless the American Racing system is a modular system like the SLP mid pipe you'll have to change the mid pipe again

I agree to do it all at once.

The power part isn't true. First off, a midpipe/catback only yields you 5-6rwhp anyhow, so... I wouldn't be to worried about if im leaving 1-2rwhp on the table, for that just make sure you like the sound... The chambered mufflers actually give you a bit more low end torque, and the straight through mufflers give you a bit more top end....