'67 GTO LS3 Swap

[CFster]

W.r.t. #2:
Speartech can make the harness exactly to your liking/customize it. They are using regular GM ECM's and it is up to you whether you go DBW or cable operated throttle. So yes, you can tune them (yourself) with e.g. EFI-live or HP-tuners.

The GMPP kit on the other hand is very complete and very professional but you can't say; 'hey would you like to make the wiring towards the ECM longer so I can (e.g.) mount the ECM in the trunk'. GMPP is using the E67 ECM which is the fastest GM ECM around and also totally tuneable with the aforementioned programs but can only be used in combination with DBW.

W.r.t. #5:
Hooker mounts will mount the engine in the same spot as the 400 you have in now so you don't have to move the trans.

So, for $600 more I can specify harness length? Are there anymore reasons it's that much more expensive?



Just to confirm, they've cracked the ECM on the LS3 harness for tuning?