Got a 90 Ford E350; 7.3 (non-turbo). Wondering, (got a duplicate van with no motor or trans); would it be advantageous to install a dual exhaust (if possible)? Thought it might give me better mileage. Would the K&N air filter system help? If it would only give minor results, then no need to allot the time & money.

Thanks Tater

 

Tater, it would give very little results and in fact, unnoticeable.