Hi guys, new to IWSTI but not new to tuning! We have been tuning Subarus (among many other platforms) for close to 10 years at this point and are happy to finally join this site! We have noticed that the Power Bragging section on this site isn't that active, we are going to bring lots of new content and hope to breathe some fresh air into this section! All of our results are from our in house Mustang MD150 AWD dyno, for reference, stock GR STi's put down around 220WHP and stock VA STi's put down around 250WHP!
Since the 2015 WRX/STi have been released, we have been focusing a lot of our marketing and advertising on the 2015 WRX being that it is all new, but that doesn’t mean we have abandoned the STi. The 2015 STi is very impressive with mods ranging to our typical stage 1 or stage 1+ setup all the way to our stage 3 setup. This thread will detail the cars that come through our shop, the mods that have been performed and the numbers/gains that were found!
Just a quick run down on which parts go with which stage:
Stage 1:
Stage 1 is perfect for someone looking for some extra power, better fuel economy, improved drivability and more safety over the OEM mapping. Our typical stage 1 cars are in the 270-280WHP range with torque around 300WTQ.
- Stock car
- Cobb Accessport
- Stage 1 PROTune
Stage 1+:
Stage 1+ is a great option for those who want a little more power and sound over our Stage 1 mapping. The Cobb SF intake is our intake of choice with which we have found the best and most reliable gains. Other intakes will work, but Cobb provides great products that are well tested, they are always our go to! Expect to see gains of 15WHP/WTQ over our Stage 1 mapping.
- Cobb SF Intake
- Cobb Accessport
- Catback exhaust (optional)
- Stage 1+ PROTune
Stage 2:
Stage 2 is the next step. This includes an aftermarket catted or catless downpipe in addition to an aftermarket intake. A stock intake and catback exhaust can be used with this setup, but to maximize the setup, we recommend an aftermarket intake/catback be used. We prefer the Cobb catted downpipe but there are many alternatives that provide similar results. Our typical stage 2 cars are in the 300WHP/330WTQ range +/- depending on parts selection.
- Cobb SF Intake
- Cobb Accessport
- Catted or catless downpipe
- Catback exhaust (optional)
- EBCS (Cobb preferred)
- Stage 2 PROTune
Stage 2+:
Stage 2+ is for those who are looking to maximize the stock turbo and fuel setup. Any goals beyond this will need additional fueling (ID1000 injectors) as well as a bigger turbo. This will max the stock turbo and place the car in the 330WHP/360WTQ range with many cars being torque limited due to the stock clutch. We have seen cars close to 400WTQ with upgraded injectors, intercooler and EBCS on the stock turbo. Horsepower doesn’t go up all that much but add the above listed mods and you can make more torque if you truly want to maximize your pump gas stock turbo car!
- Cobb SF Intake
- Cobb Accessport
- Catted or catless downpipe
- Catback exhaust
- Equal Length header
- EBCS (Cobb preferred)
- Stage 2+ PROTune
Stage 3:
This is the ideal reliable and discreet stock block setup. With these few mods and a few days at our shop, you can transform your STi into a street monster. We have replicated this same setup for a few customers and they have all been extremely pleased with the results! You’ll get stock like drivability and spool with a massively improved top end. The stock turbo is out of breathe in the higher RPMs, that is where the Blouch 1.5XT-R shines. Top end gains of 100WHP have been seen, this translates to a car that just keeps pulling until redline. Depending on your exact setup we would expect numbers in the 350-380WHP range. This setup can be done on a budget by utilizing the stock exhaust manifold and intercooler, however, we always recommend upgrading both at this power level! For those of you looking to build your block down the road and go for more power, you can opt for the Blouch 3.5XT-R. From our testing we found spool almost identical to the 3.5XT-R, you can find the dyno graph comparison in post #14 of this thread!
- Cobb SF Intake
- Cobb Accessport
- Catted or catless downpipe
- Catback exhaust (optional but preferred)
- Equal Length header (optional but preferred)
- Blouch 1.5XT-R 2.4” 10CM (3.5XT-R optional, 3" inlet required)
- ID1000 Injectors
- DW65C Fuel pump
- Grimmspeed Top mount intercooler (or equivalent; optional but preferred)
- ’07 STi Fuel pressure regulator
- Stage 3 PROTune
Contact:
Email: Sales@Brentuning.com
Phone: 508-762-1769
Facebook: Facebook.com/brentuning
Instagram: @Brentuning
Stage 1-3 Dyno overlay
Stock - Stage 2+ dyno overlay
Since the 2015 WRX/STi have been released, we have been focusing a lot of our marketing and advertising on the 2015 WRX being that it is all new, but that doesn’t mean we have abandoned the STi. The 2015 STi is very impressive with mods ranging to our typical stage 1 or stage 1+ setup all the way to our stage 3 setup. This thread will detail the cars that come through our shop, the mods that have been performed and the numbers/gains that were found!
Just a quick run down on which parts go with which stage:
Stage 1:
Stage 1 is perfect for someone looking for some extra power, better fuel economy, improved drivability and more safety over the OEM mapping. Our typical stage 1 cars are in the 270-280WHP range with torque around 300WTQ.
- Stock car
- Cobb Accessport
- Stage 1 PROTune
Stage 1+:
Stage 1+ is a great option for those who want a little more power and sound over our Stage 1 mapping. The Cobb SF intake is our intake of choice with which we have found the best and most reliable gains. Other intakes will work, but Cobb provides great products that are well tested, they are always our go to! Expect to see gains of 15WHP/WTQ over our Stage 1 mapping.
- Cobb SF Intake
- Cobb Accessport
- Catback exhaust (optional)
- Stage 1+ PROTune
Stage 2:
Stage 2 is the next step. This includes an aftermarket catted or catless downpipe in addition to an aftermarket intake. A stock intake and catback exhaust can be used with this setup, but to maximize the setup, we recommend an aftermarket intake/catback be used. We prefer the Cobb catted downpipe but there are many alternatives that provide similar results. Our typical stage 2 cars are in the 300WHP/330WTQ range +/- depending on parts selection.
- Cobb SF Intake
- Cobb Accessport
- Catted or catless downpipe
- Catback exhaust (optional)
- EBCS (Cobb preferred)
- Stage 2 PROTune
Stage 2+:
Stage 2+ is for those who are looking to maximize the stock turbo and fuel setup. Any goals beyond this will need additional fueling (ID1000 injectors) as well as a bigger turbo. This will max the stock turbo and place the car in the 330WHP/360WTQ range with many cars being torque limited due to the stock clutch. We have seen cars close to 400WTQ with upgraded injectors, intercooler and EBCS on the stock turbo. Horsepower doesn’t go up all that much but add the above listed mods and you can make more torque if you truly want to maximize your pump gas stock turbo car!
- Cobb SF Intake
- Cobb Accessport
- Catted or catless downpipe
- Catback exhaust
- Equal Length header
- EBCS (Cobb preferred)
- Stage 2+ PROTune
Stage 3:
This is the ideal reliable and discreet stock block setup. With these few mods and a few days at our shop, you can transform your STi into a street monster. We have replicated this same setup for a few customers and they have all been extremely pleased with the results! You’ll get stock like drivability and spool with a massively improved top end. The stock turbo is out of breathe in the higher RPMs, that is where the Blouch 1.5XT-R shines. Top end gains of 100WHP have been seen, this translates to a car that just keeps pulling until redline. Depending on your exact setup we would expect numbers in the 350-380WHP range. This setup can be done on a budget by utilizing the stock exhaust manifold and intercooler, however, we always recommend upgrading both at this power level! For those of you looking to build your block down the road and go for more power, you can opt for the Blouch 3.5XT-R. From our testing we found spool almost identical to the 3.5XT-R, you can find the dyno graph comparison in post #14 of this thread!
- Cobb SF Intake
- Cobb Accessport
- Catted or catless downpipe
- Catback exhaust (optional but preferred)
- Equal Length header (optional but preferred)
- Blouch 1.5XT-R 2.4” 10CM (3.5XT-R optional, 3" inlet required)
- ID1000 Injectors
- DW65C Fuel pump
- Grimmspeed Top mount intercooler (or equivalent; optional but preferred)
- ’07 STi Fuel pressure regulator
- Stage 3 PROTune
Contact:
Email: Sales@Brentuning.com
Phone: 508-762-1769
Facebook: Facebook.com/brentuning
Instagram: @Brentuning
Stage 1-3 Dyno overlay
Stock - Stage 2+ dyno overlay