[VipinLJ]

I removed the JB4 yesterday since my car is due for an oil change in a few hundred miles and I thought I'd drive it around in stock form to clear out any error codes, if any (none that any of my code readers could pick up but still).
I cannot appreciate the JB4 more. Without it, the car feels lifeless. Till around 2-2.5k RPMs, it feels similar. But with a JB4, after that, the car wakes up and flies. Without it, it's almost very linear. I'm also positive my car pops and crackles more with the JB4 installed (I could be wrong though).
And with E30 along with the jb4, the car is a whole new beast! I can't wait to get the oil change done and reinstall the JB4 and add a splash of E85 too.
I also realized how much the weather affects performance. My car felt so much faster in winter than it does now with >90°F temps.
I know people run stage 1 and stage 2 tunes on their 330is here but from what I've read, the performance isn't all that different. My car does a consistent 4.7-4.8s 0-60 with LC and 5.4-5.6s 0-60 going WOT. This is with no other mods other than a JB4 on map 3 and E20-E30. The only place a tune shines is the way it delivers power. Tunes will feel like the car has OEM+ power whereas a JB4 makes it feel like a tuned boosted car (power kicking in after certain RPMs).
I haven't dynod my car but on virtual dyno, I get 270-275whp. I know it isn't perfect but that's all I have access to right now.

TL;DR - JB4 definitely works. I have zero regrets. I'll only get a tune if there's a noticeable difference in power compared to the JB4.