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High Flow Air Cleaner Assembly
Yost Pro Mod Breather Kits designed to be modular, this kit
allows for a custom look with an extra 2 ponies. Kit can be used
with an air filter and stock cover, or without an air filter by using
the screen, which is included. Machined from solid 6061 T6
Billet Aluminum with a unique internal breather design (no more
hoses). Includes all necessary hardware for easy installation.
VT No. Item
35-0146 Basic Pro Mod Breather
35-0145 Kit, 1999-up TC, 2002-up Delphi FI, TC
35-0184 As Above with New Style Element
35-0120 Kit, 1993-99 Evo BT
“Big Sucker" Air Filter Kits for Carbureted or Fuel Injected Twin Cam and EV2 Big Twin Models. The all-in-one backing plate fea-
tures a built-in carb support and built-in breather tunnels at each head to decrease crankcase pressure. Each tunnel exits at the
mouth of the carburetor to create a virtually closed loop system. No oil hoses, no oil fittings, and no leaking! Stage I kit features a
High-Flow filter that accepts all 1993-up oval or round outer covers. Stage II kit features a 20% larger High Flow filter that requires
an 8" 34-0548 or OEM outer cover. Both kits include a “Big Sucker" aluminum backing plate, high-flow air filter, 4 chrome banjo
bolts for Twin Cam 88 and 1993-up EV2 Big Twin, simple instructions and all the necessary hardware.
Stage I Stage II
34-0112 34-0113 1993-05 FXST Carb or Fuel Injected Models
2002-05 FLT Fuel injected
34-0178 34-0114 2006-up ST, FLT
34-1128 34-0105 Pre 2002 FLT Fuel Injected
Filter Only
All Stage I Kits
34-1128 Only
All Stage II Kits
Bolt Set
Hardware Set
Stage I
Stage II
34-0946 cover fits Stage II. 34-0566 cover fits Stage I.