if you have a header leak what are the results ? loss in horsepower ? how can you tell if you have a header leak ?if its real tiny and only when your on the gas, does it matter ?

 

yea, causes a pretty decent sound. like a pfft pfft. sounds weird.

 

Having the same problem

 

x2. running a hytech replica.

 

x3

 

Cracked the OEM exhaust manifold on an 02 Civic. Without the engine running, was too small to see. With it idling, you could hear the "pfft, pfft, pfft" of the exhaust pulses. Sprayed some water on the mani, looked for bubbles, and identified the location.

It didn't seem to effect the car, but some JB Weld took care of it.