Ynot on tdiclub.com said:Two places you do not really want to waste you money on in increasing your performance of the TDI is putting in a fancy intake system or exhaust system. The word mufflerectomy is used alot and that means the muffler is taken out and the exhaust is run straight. Not to loud for most, your turbo may spool up a little faster with this set up. The filter box gives good performance as it is, some take out the snow screen and some have removed the snorkle. The snow screen being clean or removed makes a good move due to the snorkle picking up cold air from behind the head light. One exception to this might be installing a "Old Man Intake" this may improve air flow to the turbo and has been reported by forum members to help cut down on excesive smoke.
BeezerDiesel said:still completely standard and likely to stay that way more or less.