Quote:
Originally Posted by Marty
Thanks guys, all comments taken on board. Looks like the only chance I have for an exhaust, is a catback system make by Borla (OEM). I wonder if that might be a good place to start. Then add some OEM performance headers, and leave the cold air intake out of the equation (unless it would be needed). I don't usually - except for the freeway and being late - take it much over 3,000 rpms.
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Borla, JBA, and Doug Thorley all offer cat back exhaust systems for your 4 Runner.
You have the option of a high flow muffler in stock system as well.
Bear in mind that most of the "cold air" are not per se cold air. Many draw air from the same location as stock. Most have an air dam of some sort to keep hot underhood out (built for performance crowd). That same intake (heat shield removed) could offer the lower restriction, and breath hot under hood air for quicker warmup, and better atomization and better MPG that result.