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Do you think the milltek cat back will become a restriction on mine when running near full potential with the gtx as potentially could be chasing 500's?
Bill runs a 3" system on the Ibiza (currently at 550hp)... the Milltek is a 2.75" system and the Mk2 golf with the GT3071 we built running mid 400's had a 2.5" system from a 3" DP... (although tbf its prob not ideal but EGTs were fine)
I think the Milltek back box will be the biggest headache but the tell will be EGTs... your setup is going to be pretty free flowing inlet wise so any rise in EGTs will be down to the exhaust I reckon...
Will have to see on the dyno mate but considering your setup then a 3" makes sense its just the choice of back box thats limiting as the one I had originally was perfect flow wise but was a little too droney inside the car for me... sounded ace on boost though
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