My recommendations for off the shelf exhausts is Hayward and Scott all the way and even if you decide you don’t want it, its too noisy or your going back to standard then it will hold its value quite well and you can sell it second hand. Yes, we all want a Subaru which sounds like a Rally Bred monster thundering through a forest stage with its hair on fire! Or do we?ĭon’t get me wrong I love the sound of a Subaru exhaust, especially those the size of small dustbins. Running this as 19psi gave me 278bhp at the next rolling road day, more than some of the Impreza boys got on the day which annoyed them no end especially as my Forester was an Auto gearbox 😉 I’m not going to go into how to fit this device as I wrote an article on this a number of years ago which is here: HDI-SBC install The HDI SBC comes as a kit and comprises of all the pipes, valves and other bits you will need to install it, but it also comes with a heavy duty solenoid and the boost controller itself. I went to an HDI SBC which is made by a company in Australia. So my next modification is a Boost Controller. My low result was eventually traced by Autotecnica Buxton to be a boost leak.įinding information was hard but from looking at Australian and Japanese forums, (I can read some Japanese) and found out you can easily modify a Subaru Forester Stb engine as its fairly strong if you look after it and don’t go silly with the boost. Information about non UK, newer models or even information about other Subaru models and engine designations. Sure there’s a lot of information on these sites but there’s also a lot of mis-information and irrelevant information. both of which have masses of information and chaps all “happy to help!”. Now as you can imagine I was a little bit annoyed with this as its supposed to have 260bhp so I scour the internet for any snippets of information and end up on and. Subaru claim 260bhp from the engine in the Forester Stb but this is measured on Japanese high octane 100RON petrol and not the 98 or 99 we get here in the UK.Īt the first rolling road day I took my car to the rolling road driver was unable to get a proper power reading on all the autos there that day but my car still showed over 200bhp which is only slightly more than UK standard. Boost controllerĪfter 2 and a half years of ownership and a few “ stop me quick” modifications I decided to try to eek a little more power from my JDM engine. I’d also add in decent spark plugs and HT leads into the equation to make sure your car gets the best spark to it possible. Then you eliminate the problem of potential fuel starvation and possible engine damage from lack of fuel. Before any power upgrades on a turbo Subaru engine I would always say replace the fuel pump for one with a higher flow rate than standard.
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