All Things Mk5 > Performance Modifications

Milltek on a diesel

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Trekmeister:
What sort of performance gain would a milltek decat make on a stage 1 diesel  and would a full milltek improve the performance further?
Would the map need tweaking for best gain and does less back pressure have any negative effects on the turbo?

DFish:
Full system would be the best option, depends on how deep the pockets are. Quicker spool-up due to having no blockages in the system.

I would have the map at least checked over to make sure everything was ok though.

Fish

jason_rmh:
Ive got full system with decat and panel filter on my tdi.  As already said, turbo spools much easier / quicker.

Also worth doing with a remap to get the best out if it.

Jas

AndrewJB:
i ran a complete straight through on my PD170, and when i say straight through i mean straight through, Milltek DPF Delete downpipe and then a pipe from there to back, No boxes at all

xjay1337:
Trust me on this as I have done it.

Cat Back - no appreciable difference, it will sound nicer and that's about it. It may spool very slightly faster but not enough to notice unless you were eagle-eyeing your boost gauge.

Turbo back - The cat is the most restrictive part of the exhaust system on a TDI - So it would be the best way. Removing the cat without mapping the engine accordingly can cause problems, not only will you get an error light but depending on your particular car you can encounter boost creep, which is where the car cannot control the boost it is producing, because it's expecting a certain amount of resistance but getting far less. This can push your car into limp mode at high speeds.

If you want actual performance increase then get a turbo back with an EGR delete (as this is going to be the best part getting quality clean soot-free air into your engine) and have it mapped at the same time.

On a standard car you would notice little to no difference from changing an exhaust alone.

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