Well its an 2.25in uppie and it made with:

MANDREL BEND 2.25" Up Pipe
Pipe Material: Mild Steel
Color: Dark Silver
Comes with necessary hardware
Increase 10-15HP
Application: 2002&up Subaru Impreza WRX

Would this break down thanks to heat?

Wrong forum

Bump to the right forum. Yeah, it should be fine.

Don't count on the 10-15 hp gain. Uppipes are really only worth 5-8hp (at the wheels).

2.25" is a little large for the stock turbo. 1.75" is ideal.

Thank you for replys. The reason i posted here cause nobody ever reply in those forms.

At least 2 out of 3 who replied in general do.

You still might gain 10-15 hp but it will be at the flywheel. Like mattr762 said you can expect about 5-8 hp at the wheels and that's what really counts. The only downfall to AWD is the incredible drivetrain power lose.