Mach 2 DV to Blowoff Valve Conversion Kit (for T9107, T9125) [5925]

MACH 2 Atmosphere Upgrade Kit – Convert from Recirculating to Atmosphere Venting

Includes:

• Trumpet for enhanced sound
• Firmer spring (6115) for optimal performance
• 25mm hose plug to block the recirc hose

The 5925 Atmosphere Conversion Kit allows you to vent the Mach 2 to atmosphere by ensuring the piston stays closed at idle and plugging the recirc hose. This kit includes a 25mm hose plug, a trumpet to replace the hose outlet (amplifying the sound), and a firmer spring (6115) for proper operation.

The Mach 2 comes standard with a softer 6116 spring, ideal for recirculating setups or cars with an idle vacuum of 18inHg or less. If the piston remains closed with the stock spring, no change is needed. However, if it hovers open at idle—even with maxed-out pre-load—the firmer 6115 spring should be installed to prevent stalling or backfiring.

Compatible with: T9107, T9125

AUDI TT 8N 1.8t 98-06
SUBARU XT MY14-on (FA20 engine)
AUDI S3 8L (1999-2003) 1.8t
AUDI B5 (1995-2001) 1.8t
AUDI B5 (1995-2001) 1.8t
AUDI B6 (2001-2005) 1.8t
AUDI TT 8N 1.8t 98-06
AUDI TT 8N 1.8t 98-06
AUDI B6 (2001-2005) 1.8t
AUDI TT 8N 1.8t 98-06
AUDI TT 8N 1.8t 98-06
MAZDA SP Turbo 2002 (150kW/200hp)
VW Passat B5-B5.5 1.8t 96-05
VW Polo GTI Mk4F (Typ 9N3) 1.8t 05-09
FORD AUSTRALIA XR6 BA-BF 4.0L turbo 02-08
FORD AUSTRALIA XR6 BA-BF 4.0L turbo 02-08
FORD AUSTRALIA Territory SY 4.0L turbo 06-11
VW New Beetle 1st Generation 1.8t 99-on
VW Golf GTI Mk4 1.8t 97-05
FORD AUSTRALIA XR6 FG 4.0L turbo 08-on
AUDI S3 8L (1999-2003) 1.8t
AUDI 8L (1996-2003) 1.8t