Stock exhaust has to go for stage 2... you can't run that much boost on a restricted exhaust. The lancer exhaust isn't made to support that. At a minimum you need a header, test pipe, and axle back. The piggy back was tuned for this and you'll be running rich otherwise... also your boost problem could be caused by a high amount of back pressure making it difficult for the turbo to spool. The exhaust you have is killing you. Also check for any exhaust leaks. Start the car... have someone hold a rag in the tailpipe. Use your hand to check for leaks around the header, wastegate, turbo. Do this when the motor is cold and quickly before it gets to hot. If you feel a leak in those areas it will make you spool slower and can keep boost peak down.

Get rid of the stocker exhaust... can't believe no one told you that. Boni had the test pipe and greddy system with a gutted stock header. Thus he was a free flowing exhaust. Please correct this.

 

What's the best size to go with for non-IC, stage 1 IC, and stage 2 IC?

Do you really need to do anything to the stock header? I thought exhaust system after the turbo were the only items that hinder boost.

 

stock header is more restrictive, if you get a less restrictive header, such as the road///race header, you will open up the path for the exhaust gases so that they spool the turbo quicker. it doesn't have so much to do with max boost with the header as much as it has to do with spool time so i believe. as for exhaust, either the magnaflow or greddy have both proven to work very well with the turbo set ups on lancers.

 

i stand corrected, thot he was stock everything else but teh turbo until recently.

 

Sweet, glad to know I only need to get the 2.25" midpipe from mufflertech and either highflow cat or test pipe.

 

nonRRM ppl would say that 2.5in pipes are better than 2.25.

 

From what I have read, researched, heard is that bigger is better from the turbo back. I already have the RMR axle-back, and would prefer not to dump another $350+ into a cat-back when I already have part of one. So the more I save on that item, the more I can put toward other upgrades.

 

What about the flex pipe? Isnt that too small as well? I don't see a bigger flex pipe fitting because the oil pan would be in the way.

 

you might be right, but how many non RRM people are putting more power down than people with RRM kits? bigger is usually, to my knowledge always better with exhaust for turbo applications, however, seeing as tho most people are running between 5 and 9 psi daily driver, 2.25 should be just fine. personally, i wouldn't lose sleep over a quarter of an inch in exhaust.

 

when i say nonRRM ppl i mean ppl that arent boe and rob and gurudel. boni even is trying to upgrade to the buschur dp. that quarter of an inch could make a few hp diff and if you dont have an exhaust already it would be smart to get the larger (2.5) exhaust.

 

Question is....WILL IT FIT? I think only Turboit had one...but I think he sold his car already...so no pics on how close the fitment is...

 

well he said it fit so i trust him if you are talking about hte buschur setup. im just going to get a custom one made if i cant find the buschur one for a good price.

 

Thats what I was thinking. I might just go to some mom and pop exhaust shop and see if they can make one for the relocated downpipe...