i am adding a 2.75 inch dynomax exhaust system with 2 2.5" tips i was wondering when i gut my cat and put it on what will i get for horse power?

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1988 Iroc-z (Gun MetaL)
350TPI (38K MILES)
700r4 stage 2 shiftkit
3" cat back exhaust
K&N
Mod Chip
8.8 Race Wire
accel everything
2.77 limited slip
T-Bar roof

 

The make a single 2.75". Why are you doing that if you already have a 3" cat-back. I would say an increase of 15hp over stock.

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2 Tickets to game= $250
Gas= $20
Sitting 20ft. from MJ= Priceless
'86 IROC T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK HEADERS Hooker CatBack
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat, just switched to 180* b/c of winter coming and going to college in the mts.
3:73 Posi Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

upon further inspection of my car i found i had hat looks to be a 3 inch pipe going into a stock muffler and i really wanted the low tone of the super turbo by dynomax and a system that was 2.75 came up for 75.00 so i bough it.

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1988 Iroc-z (Gun MetaL)
350TPI (38K MILES)
700r4 stage 2 shiftkit
3" cat back exhaust
K&N
Mod Chip
8.8 Race Wire
accel everything
2.77 limited slip
T-Bar roof