Dual 2.5" side exhaust with Moroso Tubular mufflers.

 

Wow that is clean, I have the tube mufflers and my exhaust is in the drawing board stage. I was going to run mufflers like yours but keep going with tail pipes to exit out the back.

 

Why? The added length of the tail exhaust is a power killer! I'm telling you, this set-up is killer! Try it.....added bonus: You won't drag your pipes anymore backing out of a steep driveway! lol!

I have two 2.5" pipes going out the side....your tail exit exhaust will have everything into one 3" pipe? That's my 5" of exhaust vs. your 3" exhaust!

 

Might try that first it would not be to hard to change to the full length if I wanted to.

 

dual 2.5 does not make a 5", there is not much difference from a dual 2.5 to a 3"

 

I had single side exit 3.5" on mine, but scraped on bumps due to car being lowered. I switched to 2.5" rear exit, and I swear I lost about 40 hp. Feels like the car can't breath now..lol

 

That is something to think about for sure since I do not have the exhaust built yet. My mufflers have a 3" I.D. maybe I need to go 3" all the way, have to change pan bar though.

 

Does your exhaust set-up include a y-pipe? Does your y-pipe feed a single 3" pipe to the rear?....I have a true dual 2.5"....ie: 4 cylinders feed a 2,5" pipe. If you have a single 3" pipe...then 8 cylinders feed a 3" pipe....you're forcing more exhaust into a smaller pipe! It's semantics.....this exhaust breathes better than a stock system.

 

Why wouldn't it be equal to a 5"?

 

There is a nonlinear relationship between area and diameter of a circle. A circle 1 inch in diameter has several times the area of a circle 1/2 inch in diameter. For example, as far as internal cross sectional area goes, dual 2.5's are only slightly, slightly larger in area than a single 3.5. Beyond that, more smaller pipes have more internal surface area for turbulence and drag. A single pipe will have less surface area even if it's much larger.

Cross sectional area of a single 2.5 pipe: 4.91 square inches. Double that for two pipes, so 9.82 in^2.

Cross sectional area of single 3.0 inch pipe is 7.07 square inches dual is 14.14 square inches.

Cross sectional area of a single 3.5 pipe is 9.62 square inches.

Length should not, in and of itself, kill power. It will tune the exhaust for a lower power band. Ie, longer exhaust pipes may yeild better power in the 2000-5000 range, and a shorter pipe may yield better power in the 4000-8000 range.

 

Oh my that is some info on exhaust.

 

A well designed & built (many manufacturers already built them) mandrel bent pipe can easily clear a stock PHB & PHB brace, so they don't need changing.

 

Thanks for that info also, I know the exhaust guy here in town so I think I can get my bends from him for a price.

 

II was going to say it tucked up nice until i saw the last pic.
clean setup though! Hows the sound?

 

Yea, I'd love to hear this setup...

 

Actually, it will. The longer the tube is the more restriction it is at the same diameter, add a few bends and it's a lot more restrictive. OTOH, as the exaust gets longer the restriction the same diameter tube presents goes down because the velocity (volume passed/time period) goes down both due to the restriction and because of cooling. Nutshell, the way it usually ends up working out is 2.5" mufflers and turndowns right after the header collectors are probably not more of a restriction than 3" all the way back, but swapping 2.5" for the tubing after the muffler(s) in that 3" will usually make little if any difference in restriction (though it will usually be significantly quieter)

 

Here's a sound clip...

http://www.youtube.com/watch?v=cLZTN4QoeII

I had the traditional aftermarket thirdgen exhaust before ( Hookers ) and drove that around for about 4 years. When this was put in I could feel the same motor wake up. The throttle response was much quicker and the motor ran much smoother all the way through the power band. I did not notice any loss in low speed torque...in fact, the car launches in first much easier than before without any stumbling....I'm sure the shorter exhaust has affected the tune of the motor a bit...perhaps a bit richer? I have not touched the carb yet.

 

I think it would run leaner.

 

Ok...that's probably why it runs better now....it was a bit rich before.