M3 World Exhaust and BPM Tune

[Ski1]

Recently Dave installed X-pipe with hi-flow cats, BPM Stage 2 tune and DCT tune. I previously had the valved back half installed. Now the system is complete. The effect was quite amazing.
- sharp and firmer mid-range torque. 2500 rpm now feels like 4000 previously. No need to shift down from 3000 - pulls like an ox at that point through to redline. It feels like a different motor. Based on Sadrick Lim's dyno result, 4000rpm now has same power as 5000rpm previously.
- The beat! A wonderful sound-track with the valves open. No droney buz - sounds like pure power to my ear.
- Much quieter with valves closed - the previous drone at 2000 is gone. At cruising highway speed you cannot hear the motor - add a dash of throttle then you can hear it - perfect. Around town with throttles closed my wife will be much happier, I suspect it may almost be as quiet as OEM exhaust for city traffic driving.
- noisy cold start gone - my garage foundations are now safe.
- GTS DCT software load is much much better. Smoother clutch action on downshifts with much finer matching of throttle blip and clutch engagement so that the effect is seamless - it is like the best heel-toe you have ever done - on every single shift. On up-shifts, the DCT clutch action is a real harmony with the engine tune; under firm throttle it provides a distinct burble and bark as the shift occurs - the effect reminded me of a Ferrari shift.
- Finally - the whole effect is in sympathy with the balance of the car and does not effect drivability, dynamics or safety systems in any way I could notice. Thanks Dave Dee.

[DaveDee]

Thank you Grant for taking the time to do this awesome write up. Everyone involved getting the experience to where it is now gets to share in the pleasure when such thoughtful feedback is provided.

[JJH]

Yours seems to mirror my experience with exactly the same software and hardware upgrades. I know exactly how you feel!!

[American Dave]

Nice write up...you need to replace front pipes for full system and results

[DaveDee]

Originally Posted by American Dave

Nice write up...you need to replace front pipes for full system and results

It's the full system Dave, they are now made in 2 halves instead of track pipes and the back section. Cutting the size down in manufacturing has made the transport costs dramatically less and the whole system fits in a small carton now.

[Rocket_Rod]

Will you guys shut up! I'm trying to save money.... and the last thing I need to to hear about how to make my car sound better and go faster !

[DaveDee]

Originally Posted by Rocket_Rod

Will you guys shut up! I'm trying to save money.... and the last thing I need to to hear about how to make my car sound better and go faster !

It depends on what you are saving for Rod