oh trust me, you will WANT to upgrade both pieces.. the H pipe about as thick as my sharpie aka very very small diamter, and it mates into the midpipe which is about the same diameter
read a few post up when I measured both of them. Instead of these awkward diameters, it will be a straight 2.5" from the H-pipe, to midpipe, then you can mate it up to the stock rear section! This will unlock some power for sure!
It's kind of hard to tell but you can see the pipe before the resonator (towards the bottom of the pic) is slightly smaller than the piping after the resonator, it's an awkward bottlenecking system.
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