Amp intergration harness, not like expected.

[undertone247]

I put my after market head unit using a Amp integration harness In my 1996 Infiniti I30 and I'm very dissatisfied. I'm getting alot of engine interference (a high pitch weise that get louder when engine revs). Sound quality not great at all, and It is just two quite.I'm look for suggestions on ways to get around these problems, or other methods that people have seen better success with.

(like may be a amp bypass harness, or removing stock amp and rewiring, or even using an aftermarket amp)

Thanks