i wish to help my dad upgrade the concours, with a new air filter and posibly new pipes. What are some of the things out there and if anyone has any suggesions that woulb be awsome, i want to start with a new air filter :steering:

Air filter won't do much. K&Ns don't tend to increase performance that much, your best bet, which won't be much performance increase at all, is a cone filter that is filtered at the top and not just the sides or a better drop-in.

If you were thinking of a new air-intake system as opposed to an air filter, then expect some performance increase. Tim Taylor (The Tool Man) has a custom Deville with an awesome new cold-air intake. That thing just cruises.

As for pips, it depends on what year. You could buy a completely new aftermarket exhaust system if it's 98+ or just replace the current pipes by increasing the size and adding performance mufflers.

It all depends.

it is a 98, ill post some pics :steering