MK4 GTI golf 2003 new upgrade

[fuzion]

For the tune: You are best picking a brand of tune after doing some research as to which one is right for you (quality, price, support, etc).

Bigger Turbo (K04, etc) Will set you back a bit as the install often requires other components on top of the turbo (eg, injectors, MAF, Fuel Reg,) plus install and ECU. If your budget is $1200, that will get you a reasonably priced tune with a little to spare.

Dump pipe can help the car along, but not really required without the tune.

IMO (Don't have a Mk4, but similar engine) the tune and a look at the air intake setup is your best investment. Getting lots of cold air in can be a cheap way to make sure your turbo is not being choked with the new found power. Once you have chipped it, you may find you want to look at the traction / handling, so I'd chip it and see what you want to do from there...

The intake on the mk4 is much less restrictive then the polo's firstly, so i wouldnt worry 'as much'. If you dont want a "intake" as such you can do a CAI to your stock airbox (as effective for a chipped mk4). (here: http://bambergvr6.50megs.com/stock_airbox_cai.htm) Stock filter is fine, or change to a bmc or pipercross "DRY" filter, not an K&N!.

Chip + N75J or H Valve & Diverter (as an oem one is probably already leaking as they are pretty ****e on the MK4's) and theres your $1200 basically gone.

Follow Downpipe, Turbo Inlet Pipe (Forge or a-like), and with all that you should be the 120-130 mark at the wheels.

Also on K04 the mk4 gearboxes wont like it that
much so you will need a LSD as well! K04 installed complete is $3-4+ and gearbox.

[bujna]

I'll just add that my Revo flash was around the $1260 mark at Peak Performance too.