[rocksandblues]

google is frustratingly limited on products and options for 335d?

Any suggestions?

I am fully deleted w downpipe, etc. tempted to just cut open mufflers and weld in a solid piece through

[Iacob]

There are only a few exhaust upgrades for the 335d unless you go custom. I believe there is the ATM exhaust, sold my tunemyeuro and atm directly (599.99 compared to 757.99). DieselOps may still be selling theirs are you can find a used one on ebay/forums.
P and L which is a higher-priced exhaust at around $1200.
Now to get to the ridiculously priced ones. These can be imported and may sound better than others, but you have the Eisenmann Sport ($2,300+) and many others are $1800+.

You could also look at 335i exhaust but I believe they need to be modified slightly. Many users used to do this back in the day due to not having a 335d option.