I'm also running a JDL catted UEL, and it solved most of my annoyance with dip. That JDL is a quality product: it was absolutely straight and true and bolted right up without any problems or hassle.
(My dealer didn't even blink at it for PA inspection, but then their shop is full of a bunch of guys & gals who mod their own cars too.)
You do definitely want a tune for it. The header will run okay-ish on a stock tune, but very much better with a UEL tune, and even better still with one dialed in to your particular car.
Quote:
Originally Posted by slydog
1. UEL since you're aiming to increase mid-range power.
2. You'd have to shop around for that answer. I have OFT combined with a JDL catted UEL and I'd say it gets rid of 90% of the torque dip. It's going to run for about $800-900, a bit cheaper if uncatted.
3. No.
4. Not necessary, but certain aftermarket cat backs could provide better airflow. A deeper/louder sound could potentially mask the dip lol. I've got a Perrin 2.5 resonated cat back installed and it definitely made throttle response feel better without being obnoxiously loud.
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