430 Challenge exhaust suggestions?

Also through in a pic of my intake
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I'll get the details for you but my understanding is that it was custom made put of Argentia. I had Competizione do all the work, I trust whatever they suggest.

 

Following Competizione's guidance it is hard to go wrong! My 430 was straight through also, but not custom as several companies offer option,. One consideration is what tracks will you be running on and do they have noise restrictions like some any tracks are starting to enforce. It is amazing tracks that were built in the middle of nowhere, like RRR, now have neighborhoods built near by and are complaining forcing tracks to set decibel levels. Just something to consider. Texas tracks may not be effected yet.

 

Capristo makes an exhaust which is basically straight through on each bank with a small resonator.
I have it paired with the Capristo headers as well.
The only pic I have is while I was in process of removing everything to pull the engine, so it's not great but gives you an idea.

I believe the X-pipe setup like you have will give a higher-pitched sound than something which is simply straight through on each bank. Out of curiosity - why are you looking to make a change?
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Gotcha. It depends how deep into the weeds you want to get on sound vs just an "easy" solution. The Capristo setup is very basic. Supposedly they were very intentional with the length and pipe diameter for maximum gains but who knows...
Here is the Capristo setup on my car (under previous ownership):
ZL F430 Barber 134.02 - YouTube

Here is s a project Fabspeed did a long time ago:
FABSPEED MOTORSPORT | Ferrari F430 Challenge Dyno Pulls
FABSPEED MOTORSPORT | Ferrari F430 Challenge Straight Pipe Exhaust

Here's a guy in the UK who made his own with x-pipe and some resonators....looks somewhat similar in design to your current setup?
STRAIGHT PIPED FERRARI! | SunVit-D3 Army F430

As you can see, X-pipe seems to be the key to the higher pitched sound.
However, this one has me a bit puzzled:
Ferrari 430 Challenge - WILD Racecar!!! #Shorts
Engine bay shots don't show any kind of X.....just looks straight out the back from each bank, yet the quick sound clip is high-pitched.

So there are a number of off the shelf solutions (Capristo, Fabspeed presumably), or having a shop create something custom with either the straight or X design. If you're doing headers as well, I would not recommend fabspeed - I have seen failures (cracking right at the welds/flange) on a 430 street car.