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I have recently done the 3.4L swap and my results are in between your and your friend's.
Starting last year I have dyno'd 4 times: starting from 2.5L stock then along the 3.4L upgrade path. The results are as expected based on the upgrade stages and based on other member's findings over the years.
2.5L - 100% stock 97K mile engine
Dyno'd (9/2017) at 170whp.
3.4L 996 66k mile engine swap - Softonic 996 tune, NHP headers, NHP mid pipes with race cats, stock 986 muffler, stock 986 intake.
Dyno'd (1/2018) at 239whp 214tq. AFRs were not good; 10.25-11.0. The dyno tech said the AFRs "were the worst he had seen in a while on a 996 or 986".
3.4L - Softronic 996 tune, NHP headers/mid pipes with cats, Beluga ebay muffler, stock 986 intake.
Dyno'd (3/2018) at 249whp 220tq. AFRs improved to 11.25-11.75
3.4L - Softronic 996 tune, NHP headers/mid pipes with cats, Beluga ebay muffler, 987 intake/MAF holder, 3.25" piping/silicone couplers, IPD plenum.
Dyno'd (4/2018) at 264whp 234tq. AFRs were excellent at 12.5-13.5
Between each dyno session, I researched/read discussions on this website for literally a dozen hours before making the parts/upgrade decisions. I set out to build a 300+hp Boxster and I believe I have finally arrived there. I believe there are probably another 10whp to find, but for now I am totally satisfied.
Thank You Thank You Thank You to all the contributors to this great website.
Regards,
Marc
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