Good backbox?

[Dazed and]

Is this worth going for? Is it right that putting a bigger backbox on reduces the pressure, which leads to loss of power and mpg, or is the listing right that you get improved bhp?

Universal Back Box Exhaust

 

[Alfonze]

Personally I wouldnt but I have a Ashley backbox specificly for a Micra cost around £100 though. With these universal ones I think you would need to get them welded to fit properlyish

 

[squarepants]

tbh i back box wouldnt really make a diffrance in performance or mpg...it hardly even changes the exhaust note!

 

[joesouthgate]

it would only change mpg if you were putting your foot down more cause u like the noise