Getting ready to have some put on my 99Z. Anyone running these?

 

I know there is a few people around here running them. Gains are the same as almost any other header, 20 hp give or take a few. Some people said they had a hard time getting them in, others said they went in perfect. I guess you gotta get lucky.

I plan on Jet Hot headers or QTP headers whenever I can get some money together.