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Let us know how it does!
The JB4 says max 35hp and 50tq at the wheels. The Dinan says 47hp & 43tq although that is unclear if at the wheels or crank.
I think coming from a 135 with stage3 you will be at a LOT less. My 335i has a Cobb at stage 1 91 octane, no mods other than Cobb and there is a very noticeable improvement, that car is MUCH faster than the Z4 and I imagine would continue to be so after adding either Dinan or JB4 to the Z4. I like the sound of the 28i, mostly on the overrun :-). It has some punch but just not in the same class. If either of these let's it be close to the stock 35i then that would be pretty nice. I still haven't been able to find anyone running the Dinan with a 28i though.
Kevin
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