Just wondering, Is it possible to use a 6 port Iron Side housing (S5 NA)on an REW engine. This way you would have a 6 port FD. I think this would give you the oppurtunity to port the hell out hell of the 6th port, and when you are doing the "normal" street driving, you can get fairly decent gas mileage due to the lower overlap and smaller first ports. Just wondering if it was even close to practical

 

If you did this, the stock twin turbos wouldn't fit on the motor anymore because you would have to use the 6 port intakes.
I think alot of work for nothing

 

my fd gets 23mpg on the freeway, the gsl-se gets about 25, thats a lot of work for a theoretical 2mpg....

 

Most of the difference between a S5 and a S6 is the side housings. When all would be said and done you'd have a S5 N/A engine with FD rotors...

Also the S5 rear plates don't have the provision for the FD motor mounts, so some fabricatin' would be necessary. As well as the intake manifold issue.

And then of course there is the little problem that 6-port side housings suck, at least as far as strength and flow efficiency are concerned. Oh and the way big huge port timing even in stock form, only the shape is nasty and you can't fix that without making the timing even further off into the deep end of big huge.

 

Custom fab an intake? You wouldnt be able to actually fit the actuators down there, you'd probably be able to use bicycle cable or something tho