...restrict power in anyway??.....

Which is the best for a YB:-

Mongoose straight thru
Mongoose with one silencer
Std Mongoose

 

Providing its as big as the rest of the system, then no, not in a significant way.

Its proven that at even 500bhp a 3" cossie exhaust starts to be quite restrictive anyhow so your far from getting the best out your engine (ie its gonna have to work harder to get the same power) no matter what....

 

Steve this is a general question...not about the exhaust i am actually gonna be using

 

No it doesnt. Im a fan of big fcuk of silencers - porkie's system looks decent.

 

IMA- Didnt say you was mate, just thought id add a bit of general info about it being not ideal for big power

Inlets and exhausts on turbo cars are ones where bigger really is better with no disadvantages, unlike manifolds, turbos, cams, ports, etc etc etc where its swings and roundabouts, what you gain from somewhere you lose from somewhere else