Id go either a BW S475, or 476R/87 with 1.25 AR T4. Should make a ton of power. It will be a little laggy on the 4.8 but the n2o should fix that. It will be a beast on the 5.3. Another option would be run the smaller .90 or 1.0 AR on the 4.8 and just by another housing when you swap engines.

 

+1...

 

I got a 3.5 DP we could swap out and give a try. Got a snap on back pressure gauge we could test before and after on it too.

Back the boost down a hair and hit it with 100 shot.

 

This ^^^ is exactly what I was gonna recommend!!!

^^^^

Even if he turns the boost down and sprays instead, the exhaust side is still too small! N2O will make more exhaust gasses as well. That 67.0/74.2mm exhaust wheel is very small for that power level.

 

Here ya go Rob! Ball bearing M480 with the T4 1.22 a/r should work great with what you want!

 

I do happen to have a Magnum JB M480 1.15 a/r and 4" down pipe ready to go in stock...

 

How convenient.......

 

 

Did i misspell it??

 

No that was my phone going wack on me lol, thought it was a good idea aswell for mine, just not quite ready for it yet.