Ok so I ordered a clutch/flywheel setup from ACT and got it installed and the trans is all buttoned up.
So I go to crank her up to hear that beautiful roar and......nothing. She turns over but won't start.

I started looking around for any issues or indications but came up empty. Tried to start it again but the battery died on me since it's been sitting forever.

So I started doing some digging and turns out, they sent the flywheel for an HR motor. Well my 2007 coupe has the DE motor. Question is, if I can get it started and it runs smooth, should I just leave it?

 

Maybe you should contact ACT and find out if it's compatible or why they sent you the wrong part.

 

It's definitely the wrong part. I was asking more out of curiosity. I know some build (havent seen it on our cars) use a larger or smaller flywheel for specific needs.