Exhaust set up to make most of the FPC sound!?

Well, my car isn't here yet, but I figured I should already start modding her by buying parts!

From what I read, stock GT350 headers were made in a way to give it some V8 cross-plane character like sound. Am I right in saying that?

Now, I want to get away from that. I want exotic in tone and I'm sure plenty of people here are looking for the same thing!

What are the options? Long tube vs short tube? Equal length? Resonator delete + Kooks headers? X pipe vs H pipe? H pipe with Kooks headers?

Kooks headers by themselves? I saw the Instagram video and thought it sounded higher pitched with just Kooks headers on an otherwise stock x-pipe/stock muffler set up + you can keep the Selective Mode exhaust.

Any help would be hugely appreciated!!

...and to take advantage of the firing order of the engine and the exhaust pulses.


Kooks is the only aftermarket supplier that has released a full system. No equal length short tube offerings yet. Personally, the only exhaust mod I would consider other than a resonator delete, which is for me by default, is equal length short tubes ASSUMING the sound profile is what I would think it would end up being. We just don't know yet.

nastang87xx said:

...and to take advantage of the firing order of the engine and the exhaust pulses.


Kooks is the only aftermarket supplier that has released a full system. No equal length short tube offerings yet. Personally, the only exhaust mod I would consider other than a resonator delete, which is for me by default, is equal length short tubes ASSUMING the sound profile is what I would think it would end up being. We just don't know yet.

Click to expand...

Well yeah, I figured to take advantage of it would be to design it around the firing order and whatnot.
Well, what do short tubes do? Instead of long tubes? All I could read off here is that long tubes are significantly louder?

Would short tube + x-pipe + resonator delete on stock exhaust most likely be the formula for high pitched wail?

http://www.hotrod.com/how-to/engine/header-basics/

And yes, long tubes will raise the pitch of an engine.

Also, keep in mind that Joe gained 24whp with the long tubes before tuning, then he gained another 53whp on a lower reading dyno after tuning and adding a JLT. Properly tuned long tubes are worth a lot of power! 77whp is tough to do with typical NA motors with such minimal changes.

Of the few setups I've heard so far, Kooks LT's + Kooks X + Stock Mufflers might be the sound you're looking get out of your GT350.

ITLRUN's_GT350

77whp? was this the full kooks exhaust with green cats and mufflers? I hadn't seen any tuned results yet. What did it do to torque?

superman07 said:

77whp? was this the full kooks exhaust with green cats and mufflers? I hadn't seen any tuned results yet. What did it do to torque?

Click to expand...

That's with Kooks full exhaust, catted LTs, JLT CAI, and a 93 octane tune. I don't know about the changes in torque or power curves because he hasn't posted the dyno sheet yet. Still anxiously waiting for that myself.

In his Z28 vs. GT350 half mile race thread, he said he gained 53whp more after the JLT and 93 tune.

A LT with cats back to the stock mufflers minus resonator would probably be my preference as I need the quieter option. Not sure if this will be possible.

Nataphen said:

Also, keep in mind that Joe gained 24whp with the long tubes before tuning, then he gained another 53whp on a lower reading dyno after tuning and adding a JLT. Properly tuned long tubes are worth a lot of power! 77whp is tough to do with typical NA motors with such minimal changes.

Click to expand...

Im not really sure you can just add it up like that. 2 different days, 2 different dynos. The baseline on the MD without the tune might not have been as healthy as the run on the DJ. He would need to go back to the first dyno and do a pull with the new tune and see what the final delta was.

krt22 said:

Im not really sure you can just add it up like that. 2 different days, 2 different dynos. The baseline on the MD without the tune might not have been as healthy as the run on the DJ. He would need to go back to the first dyno and do a pull with the new tune and see what the final delta was.

Click to expand...

That's true, but it's probably pretty close still. Even if it's only a 53whp gain combined, that's pretty impressive. The stock headers may be just that bad of a bottleneck. Any header that completely changes the sound of the engine is probably going to change a lot of the engine's ability to breathe.

FPC engines typically gain a lot more from headers than CPC engines do too. I don't know exactly why, but 60-80whp is a pretty common gain from headers and a tune amongst Ferraris. Let's cross our fingers that that's the case with the GT350 too.

What if one just wants to remove the resonators? Can that be done easily?

superman07 said:

A LT with cats back to the stock mufflers minus resonator would probably be my preference as I need the quieter option. Not sure if this will be possible.

Click to expand...

Long tubes kill the cats or make you go with high flows which in most cases, might as well not even be there in terms of sound. Lethal Performance proved that killing just cats on this car makes it INSANELY loud.

04Terminator said:

What if one just wants to remove the resonators? Can that be done easily?

Click to expand...

Yep, with some spare cleanly cut pipe and a welder. That's what I'm doing.

nastang87xx said:

Long tubes kill the cats or make you go with high flows which in most cases, might as well not even be there in terms of sound. Lethal Performance proved that killing just cats on this car makes it INSANELY loud.

Click to expand...

So longtubes are basically headers with no cats?

So Kooks headers with xpipe and stock muffler so far is the highest, most highest pitched system out? Is it that raspy in person.. or is that the cell phone video?


EDIT: Also.. check this out!

[ame]