Is the cat the biggest bottleneck of the exhaust sytem? I wana get HFC but I do not wanna spend 1000 dollars for an exhaust system. If I get HFC will that make a noticeable increase in HP?

 

Yes you will feel gains..duuuuuuuuuuuuuuuh!!

 

exhausts systems dont cost too much either.... used or new.. I have the gemini and I definately felt power gains and Installed at a friends house. Where as cats.... you better have some good tools LOL. I'd probably recommend you go with a exhaust first.

 

What do you mean by exhaust? HFC is part of the exhaust. Do you mean axel back?

 

^ lol...

here what full exhaust consist of..
HEADERS->CATS->CAT BACK EXHAUST

hope this will help

 

From what everyone says, HFC's is one of mods that makes a noticeable difference.