Originally Posted by
Mrmiata
Well okay.. been looking at them a little lately and could have sworn I read 6's had a 68mm..and going to 74mm was a waste due to the port only being 68mm.. "my bad" I guess..
Nope, the SRT is most definitely the 74mm (113 prefix on part number). Lots of the E55 guys are actually upgrading to the 90mm unit, with custom flange. Big $$$ for a small gain, unless you're willing to fab.
The 74 on the N/A is a good mod... yes, it's only 8hp, but when you started with 10...