7M = prone to HG failure, long stroke (bad for rpms), inferior engine management (old technology), poorly designed intake plumbing and exhaust manifold, prone to overheating #6 cylinder, an abortion of accessory belts which are poorly routed, stock head doesn't flow great w/o major work, horrible oiling system
1J = higher redline (7100), cleaner design, not prone to any of the failures listed above for the 7M, stock turbos prone to failure, hard to find SOME EFI parts, stock components can make 600+ HP and rev to over 8100 rpms that why i think 1j is better to start with
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