Hello all just wanted to post up about my experience with jackspania racing.i was looking for long tube headers for my 07 g35x sedan I've been trying to build up.i originally found a site speedzone performance but wasn't happy with the little bit of reviews I found then I found jackspania racing.i saw some good reviews about them mostly honda guys.so I bit the bullet and took a chance for 599 shipped and so far I'm quite impressed.1st off they came a week early.2nd they are very well made with nice welds and thick flanges I will be installing them along with the invidia q300 exhaust I picked up for 620 off ebay also practically new.ill post pics of headers soon.if they fit as well as they look then hope this helps others save a few bucks