Decat pipes

[jabriel]

Where can I buy one from for my S2? (I know promax sell them but want to know who else I can buy them from.)

Anything I need to be aware of before making the plunge? Will the drive suffer any adverse effects?

I've read that they can add upto 10-15 bhp. (depending on the condition of the car) Is this accurate?

What makes a good decat pipe?

Thanks in advance.