i have been doing these on clubgp.com for a while im on my 14th set im doing. if anyone wants their manifolds ported i wil do them for $125 shippingback included. i dont have any extra sets at theis time but when i get them i charge $175. thats $125 for the porting and a $50 core charge until i get the stocks back. when looking into what you want out of your l67 or l36 ported manifolds are just a hair under a $800 set of headers. i run them on my cammed/intercooled gtp with no problems