exhaust systems

Hi guys,

I´m currently putting parts and setup together (with Lem, thanks a lot!) for my 521 street-build. right now I´m wondering which exhaust (system) would be the "best" for my application. Do I need to go 3" or is a good (what is good???) 2.5" system ok too?
I didn´t really care about exhaust until now so I would need your help there.
My build will be a 521 with about 650hp, SCJ heads, stealth intake, etc.. and will be used 95% on street


Cheers
Franz

3 inch minimum and a straight through muffler for best performance. Chambered muffles are somewhat restrictive unless sized about 1 1/2 sizes bigger.

You can go quiet and smaller but your power will be hurt.

I have a VERY similar build and I am running 3" exhaust with an X pipe with hooker aerochamber mufflers dumped at the rear axel. It sounds awesome but loud.
Dave

IDT-572 wrote:3 inch minimum and a straight through muffler for best performance. Chambered muffles are somewhat restrictive unless sized about 1 1/2 sizes bigger.

You can go quiet and smaller but your power will be hurt.

Not to hijack this thread, but how much would it have an effect on performance? Reason I ask is I have chambered mufflers, they were a gift, not really my choice.

I have seen a 2 tenths drop at the track on a 450 hp small block. As far as hp just a guess 20.

NO FAIR wrote:I have a VERY similar build and I am running 3" exhaust with an X pipe with hooker aerochamber mufflers dumped at the rear axel. It sounds awesome but loud.
Dave

I would run this system with a 521 but not dumped. Run rear 3" pipes and you will drop some of the noise that a dumped system generates.

Yep , all dumps are good for is kickin up a lot of dust..

Purple Hornies !!

No way, they don't sound good.. They're just loud

I was joking ...

Put as big of pipes as you can fit IMO 3" is a minimum at 650hp level for a full exhaust.

I like Magnaflow mufflers, they have worked very well on my EMC stuff.

Dave C. wrote:I was joking ...

Thank god I was doubting

So the only available complete system for a street driven ´69 Mustang is the 3" Magnaflow?

out of the box.