Intak... What about exhaust?

[Lazzman]

I recently did the intake on my 4.0 OHC with a Volant model. I was wondering how important it was to change over to a high flow exhaust like a flowmaster cat back? I am getting a noticable improvement from the intake but I have heard others say that you don't truly get the full benefits of the intake until you install a free flow exhaust.

On a recent episode of horsepower TV they took a 2003 Mustang GT and upgraded the exhaust and intake taking dyno runs after each upgrade. The Flowmaster exhaust gave them 6hp at the wheels and the K&N gave them 10hp at the wheels. They then went on to add a 100hp shot wet nitrous shot, not to shabby.

I was kind of surprised that the intake bumped hp more than the exhaust though, always thought free flowing exhaust was the way to go??

Opinions or answers are welcome

 

[aldive]

Bettering the intake without doing the same for the exhaust is like a hug without the squeeze.

For best results an exhaust upgrade is essential.

 

[JDraper]

Yep, if you're gonna flow more air into the motor, you need to upgrade the exhaust to flow more out.

 

[MONMIX]

Quicker in + quicker out = Quicker Explorer.

You will get A LOT of diferent opinions on muffelers. Most people with the SHOC run 2.5 inch pipe from the cat back. Flowmaster and Bora ( sp? ) seem to be the most popular muffeler. Which one is up for debate.

I have a Flowmaster SUV 50 with 2.5 and no resonator. It performs well, but tends to be a little too loud at times for my prefrance.

 

[JDraper]

..... Flowmaster and Bora ( sp? ) seem to be the most popular muffeler. Which one is up for debate......

Borla systems are much higher quality than Flowmaster and come with a million mile warranty, but they also cost much more than Flowmaster. Flowmaster makes a good exhaust system....Borla makes a great exhaust system. You can get a good Flowie system for under $200. Be prepared to pay over $400 for a Borla system.

 

[Lazzman]

Thanks guys... Was considering either a Flowmaster SUV muffler or the MagnaFlow in Dual in Dual out 2.5" configuration. Some say the magnaflow sounds tinny on the V6 SOHC though.

 

[celly]

Thanks guys... Was considering either a Flowmaster SUV muffler or the MagnaFlow in Dual in Dual out 2.5" configuration. Some say the magnaflow sounds tinny on the V6 SOHC though.

I didn't like Magnaflow on my old Sport (SOHC). Sounded very ricey at times. The Flowmaster SUV 50 sounded much better, but I eventually put on an aftermarket resonator to quieten it in the cab.