I have a K&N and a blackbear custom 91octane tune, and its awesome! I would definatley reccomend that for starters, everyone who gets in my car is blown away when they are thrown back in their seats haha because my car just looks like a slow SUV. Not to mention the K&N sounds great, very deep throaty roar when you accelerate, so it doesnt drone like some of my friends exhausts.