don't waste your $$ on the afr gauge unless you plan on getting a wideband...narrowband only can show you if you're truely lean...it could show rich and actually be lean since they only read high 13:1 and leaner.
sleeved or blockguard isn't really necessary for 300whp.
get the boomslang obd2-1 conversion harness...i've seen 0 failure with his harnesses and only recommend those. i've seen high failure rates from a few of the big name brands because they are manufactured by a 3rd party.
any of the fabrication and tuning we can help with that.
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