Headers VS original

[75blazer454]

hi, i have headers on my 454 but they are no good..

if i buy the original exaust manifold do i lose mutch horspower? nm?


sorry for my bad english,,
kristoffer

 

[BorregoK5]

You wont notice much of a loss at low rpm's but mid to high might feel restricted compared to the headers. How well the rest of the exhaust flows could play a big part in how different it feels as well.

 

[Skigirl]

I have a 350 and just replaced headers with stock manifold. Runs just fine at speed, I don't notice any difference really. I kept my true dual exhaust with no cats so that probably makes a difference too.

 

[Z3PR]

Biggest thing you'll loose is the kewl factor. And you'll need to replace part of the exhause system to go to factory exhaust manifolds. Personally, I plan on going to Doug Thorley TRI-Y headers in the near future.