About the gktech dumps, ive seen one and compared them to an original hks dump and the difference is very noticeable!!!!!
The workmanship and quality was enough to change my mind and go for the original.. as u see in the pics ive posted earlier.....
i dont know anyone who has tested one so i cant say if they work well but If you were sticking with a stock turbo setup it would probly be ok, they are a good price.....
i also was thinking of getting one untill i compared the 2.
The thickness of pipe wasnt what was said it should be and the welds werent smooth with the joins...
but i was lucky to get a hks for $270