If you're debating an SSK now is the time to jump on it. For whatever reason ECS tuning dropped $265 from price on the UUC SSK for the 135i. I've had it on my watch list more for a future project in the next year or two but couldn't pass it up.
https://www.ecstuning.com/ES2568131/
Ultimate Short Shift Kit
Mfg Part #USSE135-2
$355.00 -> $89.45
I also go this but its not on sale at the moment.
https://www.ecstuning.com/ES2703186/
UUC Double Shear Selector Rod
Mfg Part #DSSR127-3
$129.00
Sorry if I put this in the wrong spot but I'm not the vendor.
EDIT: Pics for when they fix it...
View post on imgur.com
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2008 135i MT
A22, LWAL, ZPP, ZSP, 322, 494, 507, 609, 653, 677, 6FL
MHD, ATM FMIC, ER Chargepipe, Forge DV, VRSF Downpipes, BMW Performance Suspension, RB PCV, CDV delete