Discussion
Looking to purchase imminently and I have been looking at the Hayward and Scott, Afterburner Vortex or a custom one made locally. Cost seems roughly the same for each option.
What I'm looking for is some burble, noisier when I hit the fun peddle but something I can live with, I've done the V8 with straight pipes and 3" Blitz Nur on an Evo so I have lived with loud before but I'd rather not.
The back box that Mr Trent had fitted sounds perfect and it can be purchased with the centre section fairly reasonably, my query I guess is what would be the advantage if any for purchasing a 3" over the 2.5? I'm looking to run max of 350bhp with supporting mods of filter and remap. Certainly not chasing the power but I noticed a few people mentioned running around 340 with a 2.5".
Any thoughts widely appreciated
What I'm looking for is some burble, noisier when I hit the fun peddle but something I can live with, I've done the V8 with straight pipes and 3" Blitz Nur on an Evo so I have lived with loud before but I'd rather not.
The back box that Mr Trent had fitted sounds perfect and it can be purchased with the centre section fairly reasonably, my query I guess is what would be the advantage if any for purchasing a 3" over the 2.5? I'm looking to run max of 350bhp with supporting mods of filter and remap. Certainly not chasing the power but I noticed a few people mentioned running around 340 with a 2.5".
Any thoughts widely appreciated
has engine been forged and do you have a sports cat ? personally if not forged i would not aim that high on standard internals , but that's up to you , is it also the standard turbo as you get into the area where you start running out of boost on mine the max was around 1.25 to 1.3 , somewhere between 310 and 330 works well and fine on standard size exhaust , i heard litchfield had a lot of fsti failures when they had been mapped with standard internals , other fsti owners may come along with there thoughts but i've had two now and both have failed on standard internals and both were re mapped so have i been unlucky , i know i'm much poorer lol but still prefer the fsti against any other car i've driven
Thanks, I'd be more than happy with 330, realistically it's a bit of noise I'm after but not too much and any power gains is a treat.
The Hayward and Scott set up seems to list 18hp increase which sounds great to me but I've read about detting in the engine so I would look to get a map and make sure everything is safe.
The Hayward and Scott set up seems to list 18hp increase which sounds great to me but I've read about detting in the engine so I would look to get a map and make sure everything is safe.
I wouldn't do 2.5" unless you are trying to keep things quiet AND cheap. As you say you do want more noise, definitely fit 3", and control noise by how many cats and resonators you delete.
I made the mistake of sticking with 2.5" because I wanted a quiet car, but exhaust back pressure quickly became the bhp bottleneck on the rolling-road, and boost had to be dialled back a bit. I wish I'd dug deep down the back of the sofa for more pennies, and fitted a 3" system with all the quiet bits (sports cat, resonators etc). I'd have another 20-30bhp and probably not much more noise.
I made the mistake of sticking with 2.5" because I wanted a quiet car, but exhaust back pressure quickly became the bhp bottleneck on the rolling-road, and boost had to be dialled back a bit. I wish I'd dug deep down the back of the sofa for more pennies, and fitted a 3" system with all the quiet bits (sports cat, resonators etc). I'd have another 20-30bhp and probably not much more noise.
at 330 i would go with the 2.5 , the 05 fsti i have has a bigger bore plus sports cat but does not feel as quick as the 04 fsti , it feels like it has less grunt , it is maybe down to the map i don't know , but i prefer driving the 04 , the differences between them is not massive both produce around 1.25 bar , i personally with that power would stick to 2.5 but again it's your choice , i would expect a 2.5 to be fine with 330 , on a na car too little restriction takes power away from them , on turbos maybe the same ? it can be noisy but still restricted enough , on the impreza the centre delete helped but it was a standard cat and a slightly sporty back box so maybe not too much restriction taken out , if power was over 330 i would probably go bigger as extra grunt would offset apparent loss of grunt in a bigger bore , what did litchfiekd do ? same size bore on there fsti at 330 bhp ? that's my thoughts your decision
i asked a tuner about the exhaust , 340 to 350 bhp it helps slightly from there up to 400 but not a lot in it , 400 plus needs a bigger bore , personally on an fsti 310 to 330 bhp is a good ball park area to be , yes you can go higher but personally i feel from the mpg wear and tear angle i feel that is enough , a fellow owner of an fsti went the whole hog turbo injectors etc engine broke in the end and not long after the mods , and in his own admission he said he wished he had just mapped and sports exhaust and left it there , i'm sure a car with more bhp is quicker but by much ? and at what cost ? i know mpg gets killed with more power but for me it's a daily drive too so want to keep mpg sensible .. ish
mmcd87 said:
Shinobi said:
2.5 inch cat back ordered from H&S along with a Cosworth air filter :-) good times!
Hi, have you gone for a straight through centre section of resonated?Edited by Shinobi on Friday 10th February 12:18
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