what exhaust system sholud i put on a EL?

You really should search before you ask such a question as its already been discussed A LOT of times!

Annnnnnnnnnnnnnywhoooo..

2.5" Mandrel Bent Exhaust is around $300-450 Fitted.
Extractors add another $400-500 fitted on top .

Any exhaust, Supercat, Redback, Lukey, as long as its mandrel bent you'll pretty much get the same..

Ring around for pricing in your local area..