Quote:
Originally Posted by swarb
My guess is because metric.
Usually piping sold in 5mm increments, but marketed/manufactured in 10mm increments, 60/65/70/75/80, In merica' we use .25" increments- 2.25"2.5", 2.75", 3" Off by a mm or three, but close enough.
Usually 2mm(1/16") wall thickness.
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Beat me to it. It's a metric pipe. Also, 3.5mm is pretty close to an 1/8 inch. Not something I would spend money to upgrade to. If you need more diameter then you'll likely need a larger jump in diameter than that.
If HKS thinks it's good enough for their super charger I don't see why it wouldn't be good enough for a similar output turbo. Ace headers are supposed to be some of the best you can get though