The Thorleys will probably offer a good hp return for the money spent.I have'nt seen any dyno results, but from my previous experience with tri-wye headers is that they will perform as well in the low and mid-range as the 4 into 1 design but give up a little in the upper rpm range.Maybe someone that is actually has a set on their truck will post a comment.

 

there is no listing for thourley headers for a 5.3 long tube for a truck any more help please do they make them and are they worth a damn

 

Try www.thorleyheaders.com

 

If I had done it all over again I probley would have put on other guys headers, why, for a small company they seam to do alot of R&D work and are at SEMA shows. And I belive have 50 state emissions compliance. I'm just too lazy to do the least amount of fab work, I don't half *** things.

 

i found the thourley web sight i will call summit to get a price how much are the other guys headers

 

bump

 

Other guys headers are $750 www.theotherguysproducts.com or www.tbyrne.com