The only JP pipe worth running on a V-SPEC is the JP-3 but you will sacrifice mileage. I suggest buying a 2050 if you want to get the most out your V-SPEC. You can probably find one for $40 or $50 on ebay or in the for sale thread. The RE-11 pipe is very close to a 2050 but the RE-11 manifold is completely different from the 2050 manifold so performance is comparable but still not a 2050. Spend the extra $ and you will have more low end than you know what to do with.