Exhaust questions

[ej205scoob]

Hi guys, New to the scion TC, not new to performance (drive a wrx). I have some questions about the TC.
First off what is the best performing Cat-back?
Secondly when do the stock headers become a restriction? If i need to replace them what do you think of the DC header? I plan to go trd s/c. Any advice is appreciated. Thanks.

-Mike

[bwood87]

I do not know what would be the best, but you are going to be looking for a 2.5" exhaust since you are going S/C.

The stock exhaust manifold is very restrictive. Each exhaust port meshes into your cat within a few inches of exiting the engine. If you look under the heat shield you can see what I mean.
The DC headers would not be my first choice but certainly better than the stock manifold. As with most headers out for the tC right now, DC is only 4-1. Some places advertise it as 4-2-1, but its not. The only true 4-2-1 that I know of is by Weapon-R.

[ej205scoob]

Thanks. What do you think of the Borla?

[bwood87]

Borla is always a good choice they are a well known brand and from what I read they make quality stuff.

[navylife59]

TRD Sparks sells the Borla, along with, the TRD. Greddy, HKS, and Magna Flow sell quality units. The sound, well that subjective. Replace the OEM header and you have a loud, raspy exhaust no matter what brand. The fault is the OEM resonator is not designed with those mufflers/flow. If replacing the header, then you should look into cat-backs with tuned resonators like Greddy or Magnaflow. Just for starts, the easiest and cheapest is to replace the OEM s-pipe with an Invidia or custom unit. BTW Meagan Racing is poor design/quality and ZPI is no longer in business.

As bwood87 stated, stay away from 4-1 headers unless your going full drag. Also, don't go with those huge turbo mufflers. They are for turbos, not N/A or S/C. N/A and S/C motors need some backpressure for exhaust scavenging for low-end torque.

[StreetracerJay]

I have the s/c with the greddy axle back and it sound great. I would recomend greddy.

[hotrice]

well i put the megan header on today with the greddy axle back and that thing is ungodly loud!. crappy thing is i tried to take the o2 sensor out of the old one and turns out toyota cross threaded the thing in so now i have to buy a new o2 sensor. navy got any suggestions on how to tone down the raspyness?

[navylife59]

A couple of bananas......

What is your complete exhaust setup? What are you running for the s-pipe and mid-pipe?

[bdis3]

I have the Weapon r header and the Magnaflow exhaust. It sounds pretty good. I am also gettin supercharged so when its done ill put up some clips.

[hotrice]

well right now i'm not running an s-pipe just header and axle back