UK Monster Owners Club Forum » .: Technical :. » Cans, Tyres, Brakes, etc. » 45mm pipes

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Old 08-08-2019, 01:38 PM   #1
1chefkev
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45mm pipes

Hi, has anyone changed the 40mm exhaust on a S4 to 45mm? how did it affect the performance?
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Old 08-08-2019, 02:12 PM   #2
Darren69
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I have a full Termi on my S4 which is a 45 to 50mm tangential system and its good for 10% more power; mostly in the mid range. Its running a PCIII custom map to overcome the standard DP map leanness and I would think its probably one of the best mods to make on an S4. It sounds incredible too which is a bonus. That said I would think that a 45mm header would be a step in the right direction too, most are strangled by the 40mm headers even the M900/900SS.
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