It could be that, it's important to stay consistent by using the same dyno. To be honest I've heard there are really no gains with this mod, but possible gains with FI. A tune is worth a try and it's the best mod you can do anyway. I did all my breather mods and actually was running very rich before the tune and picked up 31whp on a mustang dyno from the tune alone.
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Precision Turbo Tial Turbosmart Fast Intentions Seibon Prosport Advan AD08R HKS Hipermax IV Nismo Evo-R PW:JDM UpRev Pioneer Escort Volk CE28N
Top Mount Single Turbo 551whp/482wtq@10psi
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