STI Hawkeye Invidia Q300 Catback Exhaust Install
STI Hawkeye Invidia Q300 Catback
Legal in 0
Subaru WRX STI
GDB-F (N/A)
Power
See specifications
0-60
See specifications
Top Speed
See specifications
Current Market Value
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🇺🇸 US Import Information
This vehicle will become legal to import in 0 under the 25-year exemption rule. Check our import guide for details on the process.
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Moderate DIY
2-3 hours
Invidia Q300 Cat-Back Exhaust
Subaru WRX STI (GDB-F)Also compatible with: STI Blobeye GDB-D, STI Bugeye GDB-B with adapter
Estimated Cost
$850-$1,200
Parts: $650-$850
Labor: $200-$350
Horsepower
+8-12 hp
Torque
+6-10 lb-ft
Response
Slightly quicker rev response, deeper boxer growl
Prerequisites
- • Jack stands
- • Penetrating oil
Installation Progress0%
Installation Steps
1
Jack rear of car onto stands
10 min
Lift at reinforced chassis points
2
Spray penetrating oil on flange bolts
10 min
3
Disconnect rear muffler from midpipe
15 min
4
Slide muffler off rubber hangers
15 min
5
Disconnect midpipe from downpipe
15 min
6
Remove midpipe from hangers
10 min
7
Install Invidia midpipe
20 min
8
Install Invidia rear muffler
15 min
9
Torque rear flange
10 min
10
Verify clearance and alignment
10 min
11
Start engine, check for leaks
5 min
Parts Required
All parts needed for this modification
Invidia Q300 cat-back 3-inch
Quantity: 1 • $720
Exhaust gaskets
Quantity: 2 • $20
Tools Required
14mm + 17mm sockets
Common
Pry bar
Common
Supporting Modifications
Additional mods recommended or required for optimal performance
3-inch downpipe
recommended
Full 3-inch system maximizes gains
ECU flash
optional
Tune for new exhaust
Tuning Requirements
ECU Flash Required
Dyno Tune Required
Estimated Tuning Cost
$0
No tuning required for cat-back only. Downpipe addition would require tune.
Disclosure: We may earn a commission from purchases made through affiliate links on this page. This helps support our comprehensive modification guides. See our full disclosure policy.