Thread: exhaust size for 500whp

Im upgradeing my car soon and was wondering if it would be necessary to run 3in exhaust all the way back or if 2.5 would be enough. Just want any suggestions or ideas on this thanks

I'd say 3" would help you get to 500 a lot easier lol

all motor VE's run 3"....what do you think?

Well I was looking at the new precision 6262 and I read that the 4 bolt exhaust version only comes in a 2.5 in. That was my concern I was just thinking why would they make a 700 whp turbo that comes in a 4 bolt 2.5 in exhaust side. So I was going to just buy the v-band version of it cuz its 3 in. If I get a 4bolt 3 in downpipe and connect it to the 2.5in exhaust on the turbo would it flow the same as a 3 in v-band exhaust.

The 2.5" can flow enough to make over 500whp. Prob closer to 600whp. 700 is going to be a little more difficult. The VBAND will flow a lot more.

The difference between the 2.5 to a 3" is substantial. But I guess it just depends on how hard you want to make it on yourself to make all 700hp with that turbo.

3'' definitly

Are you also going to run 1.25" intercooler piping? Because that's about the size of the compressor outlet.


No. You will want to have a good transition from the 2.5" outlet to the 3" downpipe. You will need a cone to make the transition.
Or you could go with the 3" V-band outlet. That would be a little bit better than the 2.5" outlet expanded to 3" for the downpipe.




When I read 500 WHP I was going to tell you that a 4" exhaust would be preferable, but it can be done on a 3" exhaust if you insist.

^ true on the 4'' most people run into issues with power gain on larger boost levels with 2.5in exhaust and DP running moderate boost levels with moderate power levels wanted to be achieved. if you want big power, a small dp and exhaust will become a choke esp when you go to a large boost pressure.

That is just the turbo outlet, the less restriction after that point the better for higher numbers. You need 3" turbo back.

BRent

As mentioned before you need the 2.5" to 3" transition off of the vband. I ran into this problem with mine thinking it was actually 3" vband but it is not.