I tried a search and it seems that 99.99% of the people out there are only trying to meet 250-400hp. Well, I'm looking more for a 600-650hp goal and I want to make sure the IC pipiing I get it right. I am looking to drag race my car with a b18c1 and pt67 turbo probably pushing anywhere between 20-30psi. I have not picked up an IC yet because I am having an even bigger issue there(size, air/liquid, air/air etc etc)

Any help will be appreciated

 

i have a honda/acura turbo book and im just going by the book, it says for 400hp and more 2.5" will work, no need for bigger than that.

 

2.25 is good enough for 600 WHP+

 

I would say 2.5" at most. Now if your going for crazy HP like over 700+hp. Then you might want to run 3". But the bigger piping will create more lag. Maybe not a significant amount but it will be there nonetheless. Right now I have 2" from the compressor to the intercooler. Then 2 1/4" from the intercooler to the charge pipe and the charge pipe is 2 1/2". Basically what comes with the Rev Hard Stage 2C Kit. I do plan on upgrading to 2.5" piping in the future with a bigger turbo. But for now it works fine. I mean unless you tried to run something like 1.5" piping. I really dont see any problems for the normal steet car.

 

Thanks for the help guys. I was thinking 2.5in would be fine but I just wanted to make sure.

 

yea 2.5 you should be fine