Speedworx did my tune...i built the car mostly myself with help of my uncle with a few bits and peices.
Long storey short: Well i blew my d15b4 motor that was originially in it....then i put my b16a2, was bored soo did some research about how the b series can take upto 6-7 psi safely on stock internals...soo i bought a turbo kit. got a bunch of mates over. installed the whole kit from 6am to 6pm on a saturday...then got some exhaust issues and stuff ironed out over the next week. and then got a tune done by speedworx. car ran fine for bout 4 months. then i was dragging my mates r32 on mitchelle freeway and dropped it back to 3rd and FINISHED.....i cracked the ring housing on two pistons....soo i meen i've heard of people that have used 6-7psi on stock internals for over 2 yrs and have been fine and my motor only had 30k on it before i did so weather it was the tune or just wear n tare i dont know. But i rebuilt it since then with all forged setup and now i havent had a problem since and i thrash the shit out of my car....
Im extra cautious now...i make sure every little problem gets ironed out before i drive it too long. because be aware that having a turbo kit does put alot of strain on your car and will need alot of maintaining.



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