I'm getting ready to install this h/e and was wondering what is the best way to install it. I've read that you can use it with stock heat exchanger or by itself. Has anyone tried this and know for sure what works better. Please let me know

 

There are seriously 575345 threads and posts asking this. The difference is minimal. But with the OTTP h/e, I would leave the stock one on just so you don't have to take off the bumper.

 

It's been said that leaving the stock one helps because the chin spoiler is designed to route air to it.

On the other hand, there are people running just an aftermarket H/E with no problems. Its up to you.