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They don't add much hp but instead add life too your turbo system and allow more runs to 120mph without heatsoak. I had my car untuned with a Dinan intercooler, oil cooler and exhaust and felt very little difference while driving it. The tune and DP's add the most noticeable difference from what I can tell. Intakes, FMICs and others will add it on the dyno but you may not feel it.
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335i coupe Montego Blue Dinan stage 3 tune, Advan RS wheels 350whp/365wtq
1994 Brooklands Green Acura NSX Comptech Supercharged 390whp/300wtq
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