Ste have you actually seen a jam manifold and a standard manifold in your hands and seen the differnce. I have and after you've ported the standard manifold the difference is minimal, by porting the standard mani you wont weaken it if you do it correctly, it will be the same strength as before and even better if you polish it up after. As this strengthen the manifold by removing imperfection in the cast, I recon theres more chance of the mani cracking before it ported on standard boost than after running 1bar. I've had my ported mani on for 6months running 1bar for most of the time and I've had no problems what so ever and alot of other people will tell you the same thing. Granted your not going to see the same gains as a zisco, wepr, race-tech or similar. But the price difference of porting a standard mani and getting a jam one, Imo Its not worth it but that my opinon and I wont change my mind.