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The ISR doesn't have the merge collector like the Z1 header does. Both use the same primary diameter tubing. Z1 has proven to provide a 16whp gain from this thread
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07-24-2023, 09:59 AM
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Join Date: Nov 2016
Location: Atlanta
Posts: 139
Drives: 10' G37S White 6MT
Rep Power: 9  |
The ISR doesn't have the merge collector like the Z1 header does. Both use the same primary diameter tubing.
Z1 has proven to provide a 16whp gain from this thread over stock. https://www.myg37.com/forums/engine-...er-thread.html I saw someone local retune his car after installing ISR shorties with 3" intakes and gained 12whp. same dyno, different day (things to consider)
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