hello , i have a 1994 chevy k2500 5.7 tbi , mostly stock except a k/n cold air intake , i have been looking for a way to get a little more out of my engine so i can tow my 19 foot travel trailer with out my automatic tranny shifting into first gear on the mountain passes in b.c. , i have looked at many possibilities from headers and catback exhaust to a jet performance 6 pack system , i dont want to waste my money on something that might work, any ideas anyone can give me would be greatly appreciated , the motor only has 170 000 km on it and the rest of the truck is mint. thank you