Okay, first off I HAVE searched and noone seems to know the answer.
Second, I don't want any opinions, just fact.

My question is what is the difference between the 1986c and 1986tt?
I have read Injen's website but it doesn't make sense...

1986c is SS, 60mm piping with H-pipe and 4" tips
1986tt is SS, 60mm piping with H-pipe and 4.5 " Ti tips with slip-fit?

I don't understand what slip-fit is and why Ti edition is more expensive...just for the Ti tips!!??

Thanks in advance.

 

the piping is actually bigger on the track 1...
and i have jsut recently seen this exhaust dyno 450whp on a single turbo stock block