as i have read on here they do increase HP quite a bit... but has anyone recieved a good increase in MPG? iam very interested in getting these for my 2007 Single Cab FX4 to match with my Magnaflow Side Exit b4 rear tire..... any input would be greatly appreciated....

 

anyone on here got these?

 

I got them do some more searching With the set up below I got 20 MPG on a 100 mile trip

 

well not bad considering you have a Supercharger and i wanna stay NA... i think it would help out my gas a lot as compared to the factory manifolds.....

 

on my n/a engine, i gained 30hp/35ftlbs. didnt notice a mpg increase though, but the sound and power was well worth it!

 

can anybody tell me the minimum mods that you need to do after installing the longtubes + cats? to hook it up to the stock muffler? I want to do a true dual, but am concerned that everything together might be too loud. Wanna hear it w/ just the headers and cats first...