Charlie_Boy

I managed to get hold of a second hand prodrive backbox exhaust for a STI04. Before i get it fitted and declare it to the insurance company, just wanted some questions answered.

1. Is the exhaust simply a stainless steel exhaust or a performance exhaust?

2. What BHP increase does it give?

These are the questions my insurance company wanted to know.

Any help appreciated.

53

iTrader: (41)

1. Stainless Steel
2. None

IMHO

B0DSKI

iTrader: (17)

100% Agree, quite a restrictive full system. And as for what gains just a backboxwill give u..............................thats a big fat 0

MikeWood

Charlie Boy

1. The rear silencer is stainless steel and it does increase performance

2. 8-10hp on an otherwise std car, pretty much the same as any other unrestrictive rear silencer.

Mike

andythejock01wrx

I don't doubt the 8-10 bhp difference from std, although when Andy F remapped my car he reckoned a less restrictive backbox would have given up to 10 bhp more than the Prodrive exhaust.

Anyway, this exhaust is really about giving a nice subtle burble.

53

iTrader: (41)

Also the insurance company will be interested in what the manufacturers 'claim' the power increase to be.

I would love to see the power increase tested and to know how it is achieved, as the Std STi back box is already very good.