Has anybody used these headers?

I’ll second starter clearance with the mini starter and TTI headers. Not possible with the stock monster starter. IDK about Doug’s headers.

Plug wire clearance was good with the TTI.

An “H” or “X” pipe provide a slight bit more power over a true dual system. I figure your going to run a full exhaust, so, ether one will do best. An open header with the appropriate extension added on makes the best power but it would be muffler less and loud, so, I think the above post is slightly off. Unless, that is, you can run open headers on the street without care or concern.

A properly constructed exhaust system for a zero loss in power is super difficult to do under the car. You really just don’t have the room. There is more power loss due to muffler design, size or available flow rates (AKA Not enough flow) than a full length pipe end to end.

A full length muffled exhaust will about never make the power of a open header. To put a 5hp value on it?
I don’t fully understand that one.