Will ITR manifold bolt to stock GSI Cat ?

got it all fitted today - hi tech products

from headers back 2.5" piping all the way through 4" muffler

sounds crazy gettin silencer for it but power wise improvement

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Originally Posted by Slow96GSR

2.25" on the stock GSR but I could be wrong. I never measured mine before I went to 2.5" but I remember someone elsewhere saying 2.25".

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2.25 on the stock gsr is correct.