Best sized exhaust for stock 4age

[jdmtrueno]

Hey dudes,

Looking at getting a new exhaust made in the next couple of weeks.

Looking at a stainless steel system from stock manifold (or if i can find aftermarket extractors) to the exhaust tip. (Cat+tip+bits in between)

Engine is 4AG (biggy) stock for now.

I hear 2.25" is the optimum size for NA.


What do you guys recommend?

Magnaflow hi flow cat/tip?

I'm all ears, if not i was contemplating the Toda CAT back system 60mm diameter.

Cheers

[70XIN]

2.25", no more no less

muffler wise .. anything .. try and keep it straight-through as much as possible .. and if you can remove/gut your cat that would be good too

[roadsailing]

if you plan to never do any mods ever then 2 icnh would be fine if it didnt have too many bad press bends. I'd run a resonator too, as they sound pretty shit with just one muffler.

[eightsixboy]

You can use a cat from a commodore, i use one on my system, they flow well apparently.

I have also been told that if you are going to get an exhaust done that has press bends you should go up a little bit in size to conpensate for it, so i guess around 2 1/2 with press bends or 2 1/4 mandrel bent. But unless your 4age is making 200hp i doubt itll make any difference :greenbounce: . Same goes for extractors, its more of an 'looks' thing, standard manifold flows well and should do for 99% of applications.

Cusco have awesome looking extractors which you can get from ajps on this forum :2thumbs: .

[jdmtrueno]

Thanks guys,

At the moment the 4AG is stock, though I'm hoping to pick up a spare engine soon to do some head work like: cams, quads, etc So hopefully 2.25 will be fine with that also.

[Robo86]

2.25

[jdmtrueno]

We'll roll with that size then

Probably get a resonator put in as i don't want it to be tooo loud, though it probably will be as i want a muffler which is basically straight through. So its a bit of a catch 22.

[Cerby]

hey how much were those extractors from ajps just for reference??

[jdmtrueno]

<div class='quotetop'>QUOTE (Cerby @ Aug 27 2008, 09:56 AM) </div>Had a look in AJPS Cusco thread. Seems they were $950... now their $1050 last posted 5/8/08

[federal]

<div class='quotetop'>QUOTE (70XIN @ Aug 26 2008, 10:40 PM) </div>you do realise that with a new cat you are only looking at around 2% flow difference.....