Quote:
Originally Posted by red6spd
I'm still not sold on it. I saw first hand and have a vid of a 40th with full bolt-ons and a tune lose peak hp and tq and only gain about 5-6hp/tq midrange. IDK???
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With a factory tune the gains are better. Some tunes (including a canned one from uprev that I had) show no gains at all installing the M370. Most likely you need to re-tune properly after the M370's install to see the gains again, as it does affect AFR.