Boom

 

 

^^ Rick, those new tips are fire!

 

I would happily forego up to 10whp if thats all you lose with the PSE, but the power isn't my biggest concern. I have heard that the PSE will have heat/pressure build up when you start going beyond the standard bolt on.

Will love to hear Ricks input on this and also we his results with the different exhausts.

 

a lot of hysteria drummed up about heat/pressure build up from the PSE is fear mongering to get people to purchase an aftermarket system

we don’t own 800whp turboed cars trying to force all that flow through a stock 2.25” PSE

I’d like to keep my tin foil cap on

 

^

I'm gonna call bull**** on the heat buildup. This conversion removes the inherent bottleneck from standard headers/cats which are at the hottest point, & unlike the side mufflers in a 911 that are usually removed because they hold heat, the PSE cans are already exposed/cooled - they're in a low pressure zone too so the hot air is getting sucked out of the bottom of the car.

You have to be under full load for long periods of time to generate enough heat to cause any concern. Not really possible on the street to begin with, and the basic routing of the exhaust is already well-designed not to create hot spots. I'd say you're more at risk of cracking an RS muffler just because it's titanium than be at risk keeping the standard mufflers. Not to mention you'll probably have the valves open when using the loud pedal anyways thereby decreasing air friction further.

Class dismissed

 

Thank you. Good to know. Hopefully Rick gives some numbers on the hp differences between a GT3 muffler and PSE. The 4.5L kit is definitely a mod I want to do and running with PSE would be perfect.

 

Stock pse is fine and the best civilized option short of the $7k full titanium Akra system which is so sweet but so much $. Everything else is a compromise.

Never seen or heard of an actual heat issue with the stock pse. RL myth.

 

I NEED a set of those!

 

I agree. The only time it is an issue is if you force the valves closed with metal wire or something. But even then it kind of runs OK (just sub-optimally)

Over time I've had three different exhausts including PSE (and 4 kinds of exhaust manifold) on my car and contrary to what was claimed by a vendor none made a lick of difference in terms of oil temps.

PSE is the only one which does not drone at all with the valves closed and the power loss is minimal. With my 3.8L X51 I could compare 1:1 with the same setup with way better exhaust manifolds and a race exhaust and the difference of those two things combined was 10 HP and no extra tq. So PSE by itself loses less than that on a 450 HP car, probably about 5. You'd struggle to measure the difference never mind feeling it. I doubt the losses increase much more at the 500+ HP level.

If I was using my car on the road I wouldn't go for anything else. The main reason I stopped running it is that with the valves open it gets too loud with race headers for some tracks.

 

It's the 2.25" OD thing that bugs me with the PSE, and the PSE was designed for the 3.4L.
So even though a 2.5" OD (23% more area) may only contribute somewhat minimal HP and temperature benefits, it just seems more appropriate for >3.8L.
There are a few systems out there, including the Akrapovic, that use a muffler system similar to stock, but use the larger pipe.

 

Yeah but technically I don't see much reason to worry about it. It's not perfect but neither is it a significant restriction. Each 2.25 inch pipe serves only 3 cylinders and 1.9-2.25L of displacement. And due to the location of the engine it's a short distance too which factors in heavily when it comes to backpressure. If it was a front engined car with pipes 4 times as long then yeah you would probably want something larger.

 

Good points Jan, I'm always looking for perfection. ;)

 

Ummmmm, it says 4.5L on it...