I have or had a mercruised 260 pre alpha. the new drive and gimbal housing are alpha 1 gen 1. the inner transom plate is pre Alpha. My question is do I have to change the Y pipe to Alpha or will the old 3 piece Y pipe bolt up not using the center bolt. Will it seal and be reliable? Or do I need to change the transom bracket to Alpha and the flywheel cover to Alpha and that leads to all alpha exhaust and more $$. Any good advice would be great