Ok, I finally got a TBS. I got a smooth bore like Smoke20's because I want the gain without the sound. I had a spiral core TBS on my 91' and it sounded cool, but got on my nerves on long trips. So now im confused cause some say it works great, some say it doesn't work at all, some say only spiral works, and others say smooth bore works the best. Can I hear from more of you guys with a TBS on the 99 + Gen III motors? I need more input so I know if I should bolt this thing on or opt for a different one. Thanks!

 

i have a tbs on my 00 5.3l and you cant hear it, its a smooth bore

 

Hearing it is not the concern here. What you really need to know is whether or not they increase performance. Smoke20 says he lost a full second on his strip times. I'm not sure I believe that but everyone seems to agree that there is a notable increase in power. Most of the people on here seem to have the trans dapt tbs whatever that is. Everyone on here who attests to trying one out say they saw a performance gain so that is what matters. I fully intend to go buy one just as soon as money permits.

 

Well I just bought a smooth bore one from a nearby machine shop which specializes in racing modifications. It was $40. He said it is identical in quality, and measurments to the trans dapt. The only difference (so he says cause Ive never seen a trans dapt in person) is that it is polished to a mirror finish. I'll be picking it up tomorrow. I'll let you know how it goes.

 

Oh and racethisz71, how much of a difference did it make in your truck? Your engine is the most like mine so i'd prob get the same results.

 

I think this is the one everyone has been talking about. Sorry about the long link...

https://www.jegs.com/webapp/wcs/stor...y=OrderItemAdd

 

I searched for it on Jegs. Your link timed out on me.

 

I don't run on the strip, but I've got the Transdapt smooth bore TBS and when I put it on I noticed better throttle response and it actually added 1-2 mpg for me. But, I've got a different driveline setup than you so I can't promise you you'll get the same pros. I know hunt4game and his 05 5.3 got better response, but I don't think it did anything for his mpgs.

 

Im sure I'll get something. Those 6.0L are nice. You so much as think about adding a mod and they run better. LOL.

 

the torque curves make a difference... or it did on mine anyway