Exaust upgrade

[swrt]

Hi guys what type of gains can i expect on a 50mm free flow over the 45mm standard pipe.

The car specs are as follows M10 with a 1.8 Golf Carb the original fail quite dramaticaly.

45mm pipe standard rear box not to sure about the front.

It is being converted to fuel injection shortly what would be the best diamiter

[Jhonno]

less midrange more top end i reckon.. dunno how much it'll notice tho

[swrt]

So in your opinion is it worth it or should i just change the factory back box