Ok, so October '03 (yes, I know, loong long time ago) I purchased some March underdrives from a friend and just never got around to installing them. Well, our dyno tune is coming up this weekend (I'm actually supposed to tune Sunday) and I'm wondering if I should install them before the tune or if I will be fine after? Yes i know they don't produce much of a gain for HP/TQ, BUT, one thing I did notice when I had them on the truck is the motor was able to spin up faster (Which can only help my car get going quicker, right? ).
So, I guess my real question is, should I install them now, or am I ok waiting 'til after the tune? They are going in one way or another, just haven't descided when yet.
So, I guess my real question is, should I install them now, or am I ok waiting 'til after the tune? They are going in one way or another, just haven't descided when yet.