Mk 5 GTI back box yes / no?

[PHILLMKV]

Hi to all. I am fairly new on here but know my cars. I have a Golf GTI Mk 5 and was wondering whether anyone has put an after market back box on one. If so which one, is it loud and any performance increase? Thought i might get one made so it looks fairly similar to standard one but without all the boring stuff that makes it quiet.

[bn9af]

can't see any power increase just from a backbox. As for volume, it will vary hugely between manufacturers.

Since the GTI is a turbo, get a proper system: downpipe, sport cat and cat back system, you will see a decent return. At the same time, get it remapped.

Jobs a goodun!

[cuprabob]

The majority of people fit Cat Back Milltek systems which sound better without being over the top. It may release a few extra BHP but if power is what you want you need to get it mapped

[PHILLMKV]

True true. I wasn't expecting a massive power increase just most standard back boxes are quite restrictive and as u prob know turbo'd cars don't need any back pressure in fact it has a detrimental affect. So i thought any free flow back box would be better. I dnt really want to go down the whole exhaust system route because i have a 20000 mile minter on a 56 and want to keep it as standard as poss. Just wanted a little more noise. What ya reckon ?

[PHILLMKV]

Thing is turbos are never really that loud anyway. With the exception of 1000 bhp skylines. I do want it quite loud. I had a polo gti before and had it revod to 212 bhp from 150 remapping is cool. Might have to be done on the Golf