[NapsterAU]

Originally Posted by Coupes33

I agree with you that the squished area must be affecting the flow. However, I ran a 11.28s run with Classic RBs and E60 fuel using the stock squished outlets.

That's insane hey. Maybe the front turbo is doing all the work haha. I don't know.

[Esixty1]

Originally Posted by NapsterAU

How restrictive are the stock outlets for stock turbos?
The squish on the rear pips is crazy and surely must be affecting the flow?

When I had my engine out for replacement, my initial thoughts regarding that squish was like WTF! But when you have a good look at it, the top and bottom indentations are offset and the the pipe is wider in the other plane to help compensate. I also noted that the factory power ratings for RHD and LHD were the same (maybe this is one of the reasons these engines are relatively mildly tuned so as not for these things to be a factor?). So the factory outlet went back in ;-) It'd be good to see the relative flow rates though, LHD to RHD.