Which one is better Fastman or Holley?

 

fastman is a holley modified. so go with the fastman

 

so, if i am going to do more towing, should i get the 50mm

 

Look at www.thefastman.com website. He recommends the 50mm for the 5.2L and also for the 5.9L if you do much towing. I just installed mine this week and it has definitely improved throttle response and low end torque. He does excellent work! He can help you with any questions you might have as well.

 

I believe you are referring to the aftermarket Holley. It is a 52mm which will be more than what you need if you have an unmodified motor and want to tow. Unless you just want to pay for a big chunk of aluminum I would go with The Fastman 50mm. A bit cheaper too.