Ok, I have been trying to research this for a while and can only find info on the greddy single tic. I have a dual Tic installed and want to add a test pipe. I have found that the greddy goes from 70mm down to 60mm and then finally 50mm at the tips. Question is would it be better to get a 60mm or 70mm test pipe for this? I have read a little about a bottleneck effect if the wrong size is used...If anyone wants to get rid of there TP with cel fix in the appropriate size I can paypal the funds, also.

 

I use 70mm on my dual ti-c.. Go to advanced speed shop .com and the invidia 70mm with built in celfix is like $72 shipped

 

nice, thanks, this is exactly what I needed to know!