This was one of the runs done by hooker headers, afaik they all fit like this.

That's how neonmike22 took care of that issue!
I've seen someone mod their front motor mount to tilt the engine so it doesn't smack the firewall. Either way, to put it in you'll have to do something, especially with a 2.4.
Does not line up with the stock catback, you will need some sort of adapter angled properly to connect it up.
It definatly took away some power after removal! Also allowed me to make 146whp with bolt ons.

Just like a lot of great neon parts, you can no longer buy these new. After selling my first one last year, I picked up one for $130, but they go for much more than that.
I give it 8/10, it's actually a great piece minus the firewall issue.
I'd say they are second only to the blackdog and certain one off custom made headers.