Free: Contests & Raffles.
Wow. Big air filter last longer. Filters better. Plenty or air if needed. Way cheaper then fancy kits, so ya its a great mod. Stock exhaust is crap and does improve things. $300 kit easy to bolt on. KF did you read my truck trend link I posted for him? You need to. Baker your claims refer to newer trucks and is correct but not true on older diesels. I forgot gauges which are VERY important-EGT mostly!