Here's my setup
https://www.performancetrucks.net/fo...d.php?t=418428

 

i disagree. single seems to be the answer IMO. the trick to getting good track times is getting it going fast down low because once you get going fast your pushing a heavy brick

 

Highly recomend a stall around 3200 to 3600. When we first got the cam in I had problems keepin it runnin at red lights lol but after nelson did his s/d tune the idle was fixed and it really came alive. Huge difference in power, awsome! I wouldnt step down a size at all on a 6.0l. I just bought a 3200 stall and I cant wait to get it in. But with the stock stall it takes a second for the power to kick in but when it dose you better have good traction cause it lights up my 295-45-20 up easy. So far the cam has been in for about a month 1/2, you will really enjoy it

 

Long tubes will fix that problem

+1

OH those dyno numbers where b4 cam, pulleys, and live tune

 

I changed from a single 3 inch exhaust to a true dual 2.5' in/out 2.25" with a single muffler. 2.25" was the biggest we could get over the rear axle with the lowering kit. After reading flow charts, there wasn't a huge difference from 2.25/2.5 diameters, at least not while running dual exhaust. I have notice peak pulling power moved from 5500 rpm, down to a more usable 4500 rpm. After I raise the truck back to stock hieght, I possibly will change the tailpipes to 2.5" to see what effect that might have.

 

ill send you my 226r for your 228r