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Nowdays and since 1998 with the first TDi, there were big improvements on diesel motors.. and since 2000/2001 when the first mappings and aftermarket parts appeared, some diesels began to make some shadow on the petrol's..
Nowdays, around here is very common to see those first TDI's, the Ibiza GT TDi with 250000km and more, pulling around 160, 170 hp
by personal experience, these cars run better with minor mods.
decat with 50mm downpipe and remap should be enough.
Maybe an 50mm exhaust line should approve but never tried.. the original is 46mm.
know about dci´s with 60mm exhausts, BMC CDA's and becomes slower..
Even with a different turbo the original turbo pressure works better.
A mate got one rolling an Megane 105 turbo and is pulling 115hp.. feels quicker reving also. but had to make some adjustments in the actuator since originally the turbo has variable geometry.
Mine's not measured since one year ago and had some minor remap adjustment.. So i'm pointing between 105 and 110hp