K8 Ideal exhaust size

[Posey24]

Simple as that got a friend that wants to make an exhaust at his shop cuz he owes me. Wits the perfect size for power I'm Putin the HKS Hi-Power CarbonTi edition 170mm can 4" burnt titanium tip carbon fiber wrapped can

[solo_ryder]

Some will say 2", some will say 2.25"

I'd say 2.25" with a nice big resonator and that hks muffler should do. Headers will help abit too but don't expect to much gain from all this, just sound.

[Nd4SpdSe]

2.25 on a K8? People were saying lately that 2.25 was ideal for a KL...

[_-Night-Shade-_]

2.25 on a K8? People were saying lately that 2.25 was ideal for a KL...

+1

I wouldn't go bigger than 2" on a K8.

[solo_ryder]

2.25 on a K8? People were saying lately that 2.25 was ideal for a KL...

Perhaps. More and more are doing 2.5" on a KLZE as 2.25" doesnt provide the top end that a 2.5" does.

As I stated, a 2.25" would work on a k8 with abit of backpressure.. Aka stock cat (he didnt mention headers or hi flow cat) stock downpipes, a nice big resonator and a muffler of course at the end. I dont seem no harm in 2.25" and if he wanted to upgrade to klze later then he would already have a exhaust in place.

[Posey24]

Am doing a KL-DE swap which I will rebuild with forged internaks to do my twin rear turbo set-up. And for all those who doubt that or shun it...Shut Up! Not really lookin for power outta my k8 cuz there's not much to be had. Jus doin lil thing to make me happy while I get funds for the rest. I got a raise and I'll b getting a promotion soon so be ready gents for the MX-3 2.5TT

[Posey24]

Nd I'm puttin on the HKS carbon-ti muffler. 170mm can 120mm burnt titanium tip 75mm(2.5") inlet that's why I asked bout size.

[johnmx3ze]

2.5 TT...

[Nd4SpdSe]

Perhaps. More and more are doing 2.5" on a KLZE as 2.25" doesnt provide the top end that a 2.5" does.

As I stated, a 2.25" would work on a k8 with abit of backpressure.. Aka stock cat (he didnt mention headers or hi flow cat) stock downpipes, a nice big resonator and a muffler of course at the end. I dont seem no harm in 2.25" and if he wanted to upgrade to klze later then he would already have a exhaust in place.

You don't want backpressure, you want velocity.
viewtopic.php?f=15&t=41096" onclick="window.open(this.href);return false;

Indeed, for a true 2.5", you'd have to measure the inner diameter, and have it mandrel bent, but although it would be perfect to have once a KL swap was done.

[mikeinaus]

i have a 2.25" high flow magnaflow exhaust on my k8, its loud and i didnt notice much performance gain (if any) over my stock exhaust with massive leaks. i got it with the intention of eventually doing a kl swap, but im reconsidering my resonator and/or muffler.

[solo_ryder]

Perhaps. More and more are doing 2.5" on a KLZE as 2.25" doesnt provide the top end that a 2.5" does.

As I stated, a 2.25" would work on a k8 with abit of backpressure.. Aka stock cat (he didnt mention headers or hi flow cat) stock downpipes, a nice big resonator and a muffler of course at the end. I dont seem no harm in 2.25" and if he wanted to upgrade to klze later then he would already have a exhaust in place.

You don't want backpressure, you want velocity.
viewtopic.php?f=15&t=41096" onclick="window.open(this.href);return false;

Indeed, for a true 2.5", you'd have to measure the inner diameter, and have it mandrel bent, but although it would be perfect to have once a KL swap was done.

In the end its a k8, dont think he will notice a difference between 2" and 2.25".

[davmac]

All good advice on pipe size. Don't forget the resonator. You can just use a second straight thru muffler (same thing). Your ears will thank you later. Personally on a KLDE w/ headers and 2.25" pipe I used magnaflow 4" round x 20" straight thru muffler in place of a resonator. I've got essentially an OEM muffler on the end. Yeah it's old man style, but that's what I am. This setup isn't quiet, but at least my ears don't ring after driving the car.

[93GSDude]

be ready gents for the MX-3 2.5TT

..... ....

[Pure-Powder]

2.5 inch will work out great!

[RS_OBD'oh_2]

be ready gents for the MX-3 2.5TT

..... ....

+1. Twin turbo really? sounds like someone needs to read up on forced induction.