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Old 09-25-2019, 04:23 PM   #1
Scooby Newbie
Member#: 197005
Join Date: Dec 2008
Chapter/Region: SCIC
Location: Santa Maria/ Seattle
2004 SSR WRX wagon
83 Rx-7 S

Default 2.1L stroker Tuning question

I got my ej205 stroker tuned by a reputable tuner back in july. My car made 283whp and 281wtq at sea level. The downfall to my tune is that I have a stock sti exhaust on (tuners words). I recently picked up a borla hush for free and was thinking of putting it on. My question is would it significantly hurt my tune if I put the catback on? I asked my tuner and he hasn't responded yet.

Mod List:

2.1L build with the following:

Manley stroker pistons

Sti crank

11mm oil pump

Sti rods/ apr bolts

King bearings

Arp head studs

Killer B oil pickup

ID 1000 injectors

FP blue turbo

Cobb intake

Sti up pipe
Grimmspeed tmic

Invidia Catted Downpipe
Sti exhaust

One Step colder spark plugs
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Old 09-27-2019, 10:38 AM   #2
Scooby Guru
Member#: 56203
Join Date: Feb 2004
Chapter/Region: Tri-State
Location: south nj
00 RSTI Coupe
Twin Scroll 2.5XTR EJ207


I was in the exact same position on an STI years ago.....had to get tune touched up. I wouldn’t Not install the cat back until you have a retune lined up
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Old 09-29-2019, 01:34 AM   #3
Scooby Specialist
Member#: 29292
Join Date: Nov 2002
Chapter/Region: SCIC
Location: Orange County CA
2004 WRX wagon


I dont think it should bother your tune very much. just watch taht you dont over boost
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