going to install long tubes need a bit of advice
Any comments appreciated.
In my case, when I installed my LT's, I didn't get it tuned until about 8 months later when I did a cam and I had no problems at all.
You will get the most power out of them with a custom tune of course, but since you have the predator, just mess around with it until you get your A/F ratio right. Get a custom tune when you do something bigger like a cam swap, H/C, or FI.

