Final custom exhaust iteration on my N54 powered Z4!

I don't know guys, I think we're getting pretty close to perfect here! If you've been watching all along, I've since built a y-pipe to upgrade this exhaust setup. The Becker piping had this insane 2" to 2.5" step for no logical reason, so I set out to fix that. Ended up building my own version of the front half of the system, which now has dual 2.5" piping from the downpipe outlet flanges, to a dual 2.5" to single 3.5" y-pipe, 3.5" mandrel bent s-pipe, to a 3.5" v-band. This is now the front half of the exhaust system. The rear half starts at the other end of the 3.5" v-band, single 3.5" to dual 2.5" y-pipe, Becker 2.5" mandrel bent dual piping back to the Varex 2.75" valved mufflers.
This fixes the stupid issue of the Becker piping while also adding what is basically an x-pipe to the system, which cleans up the sound a bit. Listen for yourself!
Pure DD stage 2 turbos, custom relocated inlets, PSP outlets, VRSF race intercooler, VRSF charge pipe, and AR Design catless downpipes, Aftermarket 2.5" laser cut flanges at the downpipe outlets, dual 2.5" mandrel bent piping, dual 2.5" to single 3.5" hand-made y-pipe, 3" mandrel bent piping to 3.5" vband, 3.5" single to 2.5" dual y-pipe, Becker dual 2.5" mandrel bent piping, dual Varex 2.75" valved mufflers
Chapters:
00:00- Components list
00:12- Valves closed cold start
00:21- Valves open cold start
00:31- Valves closed revs
00:47- Valve closed acceleration, away
00:56- Valve closed acceleration, towards
01:15- Valve open revs
01:33- Valve open acceleration, away
01:46- Final revs

[@Krezo200]

Crazy fast

[@f2LTurboski]

Its brutaaal !

[@Dope.And.Pretty]

Heck yeah!

[@pr2688]

That is actually a real good sound you have there in this exhaust combination.... sharp and great sounding. What dimension are you using on your rims and tires... back and front ... great looking setup :)

[@Dope.And.Pretty]

19x8.5 +36 front with 12mm spacers, 19x10 +40 rear

[@szymonr5597]

what is the engine spec? Did You make a dyno test?

[@Dope.And.Pretty]

Mods are listed at the beginning of the video. Hasn't been dynoed yet but the tuner has suggested about 475whp on it's current 91 octane tune. Planning to get it dynoed and an E30 blend tune here in the near future.

[@henryaurand7951]

What do you do to control the valves?

[@Dope.And.Pretty]

Didn't like the whole remote control idea so I used a few relays, a couple momentary switches, and 3d printed a little enclosure which I mounted in the bin in the center console

[@andyguyuk1]

Fuk that thing can accelerate

[@Dope.And.Pretty]

Yeah, she's fun!