I did the TurboXS RFL-TI turbo back with one high flow cat. 2000 miles later and no CEL. I love it.Anonymous said:Turbo back should offer the highest advantages.
Eliminating the downpipe cat on the WRX offered a nice improvement in turbo spool and rpm where the highest boost is achieved. I would expect the same thing with the STi. Then leave a high flow cat in the mid pipe so you do not get the cat inefficiency CEL.
Like any exhaust, it's going to be louder than stock (for the most part).StiBoy said:I'm interested in this thread. How much is the HKS turbo-back titanium exhaust? How much louder than stock is it? Is it emissions legal? Is that a stupid question?
I'm looking for more power, but don't want an outrageously loud exhaust...my daily driver (45 miles each way to work).
Thanks, but I'm aware of all that. Of course it's going to be louder. I've heard one sound clip (the Turbo X/S, I think), and it sounds way too loud.RLsChMiDt said:Like any exhaust, it's going to be louder than stock (for the most part).
You can't just ask HOW much louder than stock it will be because it depends TOTALLY on the system you purchase. Go to worldoneperformance.com and look at the exhaust systems for the WRX. Most will fit.
You can find some sound clips on fastwrx.com ... they're on a wrx, but the sound will be the same... (again, for the most part)
That's essentially what Turbo XS says about their system "If you need to ask then it's too loud for you!"RLsChMiDt said:Well, my friend has the HKS Carbon-Ti exhaust, and it's LOUD.
If you're wondering if it's too loud, then it is.
I have a catless stealthback mated to a prodrive, and it sounds awesome. You might want to look into that. I have a video of me if you'd like to see it...
Why does it backfire? Running rich (with a BOV?), or ... are you running a misfiring system (anti-lag)!?gforced said:Nice vid, I especially like the flame that shoots out of the exhaust and the loud back fire pop.