GPI IM rod-mod
Apr 8, 2026 | 05:50 PM
Thread Starter
Racer
Joined: Jul 2014
Posts: 483
Likes: 99
From: Long Island, NY
GPI IM rod-mod
I'm looking into purchasing a GPI ported IM with the rod-mod for my 2011 GS. Will my car require a tune after installation? My current mods are 1-7/8 ARH headers, Borla Atak exhaust. The car has already been tuned.
Apr 8, 2026 | 06:15 PM
Advanced
Joined: May 2022
Posts: 72
Likes: 23
From: Los Angeles
Most likely. The computer can only compensate so much. If you don't, keep an eye on AFR and take it slow.
Apr 8, 2026 | 07:06 PM
Thread Starter
Racer
Joined: Jul 2014
Posts: 483
Likes: 99
From: Long Island, NY
Quote:
Originally Posted by
Benonmsn
Most likely. The computer can only compensate so much. If you don't, keep an eye on AFR and take it slow.
Thanks!
Apr 8, 2026 | 09:03 PM
Melting Slicks
Joined: Oct 2010
Posts: 3,024
Likes: 793
From: Tollesboro Kentucky
They said a retune wasn't required when I installed mine.Didn't affect the AFR when I dynoed it after the install.
Apr 9, 2026 | 07:51 AM
Thread Starter
Racer
Joined: Jul 2014
Posts: 483
Likes: 99
From: Long Island, NY
Interesting. I would hate to install it and find I do need a tune. $1000 for a dyno tune on Long Island.
Apr 9, 2026 | 03:31 PM
Safety Car
Joined: Sep 2007
Posts: 4,005
Likes: 490
From: South Florida
Quote:
Originally Posted by
shutout
Interesting. I would hate to install it and find I do need a tune. $1000 for a dyno tune on Long Island.
That's a ripoff, go to jersey or delaware
Apr 10, 2026 | 08:12 AM
Burning Brakes
Joined: Mar 2018
Posts: 1,172
Likes: 218
Quote:
Originally Posted by
slowtealz28
That's a ripoff, go to jersey or delaware
Where in NJ and how much$?
Apr 10, 2026 | 09:44 AM
Safety Car
Joined: Sep 2007
Posts: 4,005
Likes: 490
From: South Florida
You have east coast supercharging in cream ridge nj, and race proven motorsports in DE. Call them for prices.
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Apr 10, 2026 | 12:24 PM
Thread Starter
Racer
Joined: Jul 2014
Posts: 483
Likes: 99
From: Long Island, NY
GPI IM rod-mod
