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Old 10-20-2012, 07:17 AM
Quacker Quacker is offline
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Location: Colorado
Join Date: Feb 2011
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Mein Auto: 2012 535i xDrive
Originally Posted by Alan L. View Post
Compared to the JB4?

While I do say you get a lot of bang for your buck with the JB we aren't getting anywhere near the gains they claim on their website. From two dynos I've seen it's about 20-30whp and 50-60wtq and these were cars running catless downpipes.

Hartge's numbers appear to be at the crank so not sure how it stacks up with the JB4 since numbers are measured at the wheels.

Hi Alan,

I would not think that the 20-30 whp you quoted would support your first impressions of the default boost performance difference. I can't wait for your comments when you bump the boost and step on the pedal.
2012 535ix Space Gray, Cinnamon, SAT, Premium, Prem sound, Cold W., Sunshades, Gloss Black Grille, Gloss Black Side Markers, RE970AS 245/45/19 non-run flats that run very smooth + quiet and also correct the otherwise optimistic speedo
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