Dualie Clutched July 10, 2003 Share July 10, 2003 If I'm going to retain the cat, resonator/sliencer and muffler but change to a larger diameter piping all round. Is it worth the effort? Normally, when going to larger diameter piping, how much larger does one need to go? Thank you Keat.. ↡ Advertisement Link to post Share on other sites More sharing options...
E36UDM Neutral Newbie July 10, 2003 Share July 10, 2003 Think best person to ask is Saaber, hope he sees this if not you can PM him Link to post Share on other sites More sharing options...
Lester Neutral Newbie July 10, 2003 Share July 10, 2003 What's your purpose? From the way you described, I assume you are increasing from extractor down to tail pipe? Pls specify. Regards Lester Link to post Share on other sites More sharing options...
Saaber Neutral Newbie July 10, 2003 Share July 10, 2003 What other mods have you done to your car?...and what car are you driving? Link to post Share on other sites More sharing options...
Limws1 1st Gear July 11, 2003 Share July 11, 2003 Changing to larger diameter piping doesn't mean the exhaust will flow better when the extractor, cat, muffler etc. still restrict exhaust flow. If exhaust pipe diameter is too big, it may in fact slow down the exhaust flow because the exhaust gas temp. cool faster as it flow down a bigger dia. pipe. Hot air will flow faster. Normally, you should not go beyond 2" dia for a 1.6l car. Anyway, changing exhaust piping only make sense if the stock exhaust manifold is replaced with a more efficient extractor. Of course, that is illegal for most cars in sillypore. Link to post Share on other sites More sharing options...
Dualie Clutched July 11, 2003 Author Share July 11, 2003 I've... [*]3.5" pipe to my modified stock intake box [*]High Flow drop-in Filter (Unifilter) [*]Unichip equipped I'm driving a Airtrek 2.0 NA. So any significant effect if I just upsize the original piping? How abt if I add in a 4-2-1 extractor. Pls advise. Thank you Keat.. Link to post Share on other sites More sharing options...
Saaber Neutral Newbie July 12, 2003 Share July 12, 2003 In that case, you can put in the 4-2-1 extractor and change the rear muffler to a free flow one but keep the rest of the piping original diameter... Link to post Share on other sites More sharing options...
Modeldriver Neutral Newbie July 12, 2003 Share July 12, 2003 What's the guideline for larger than 1.6L ? Would 2.0L have a rule of thumb limit also ? Link to post Share on other sites More sharing options...
Dualie Clutched July 12, 2003 Author Share July 12, 2003 My stock exhaust manifold is the extractor/cat unit. If I change extractor, effectively I'm also decating. Possible just to change 4-2-1 extractor/decat, retain rest of exhaust including muffler. Will result still be the same as "put in the 4-2-1 extractor and change the rear muffler to a free flow one but keep the rest of the piping original diameter"? Pls advise. Thank you Keat.. Link to post Share on other sites More sharing options...
Saaber Neutral Newbie July 12, 2003 Share July 12, 2003 you can try....one thing at a time first.... Link to post Share on other sites More sharing options...
GDIzen Neutral Newbie July 12, 2003 Share July 12, 2003 (edited) Gd pt! that's why I prefer to do Stage 1 1st to see if the effect is detrimental or not. Edited July 12, 2003 by GDIzen Link to post Share on other sites More sharing options...
Dualie Clutched July 12, 2003 Author Share July 12, 2003 Thank you for your advice Guess I'll visit Man soon for a quote. Btw, since my car is relatively new in S'pore market, there'll be no ready made extractor for it. How do U rate those custom made extractor from Man (or other wkshop)? Thank you Keat.. Link to post Share on other sites More sharing options...
Saaber Neutral Newbie July 12, 2003 Share July 12, 2003 That I can't really comment.....as I have no idea.. Link to post Share on other sites More sharing options...
Modeldriver Neutral Newbie July 12, 2003 Share July 12, 2003 Was told at Fong Kim last time that decat would improve mid-range torque, while the muffler job would improve high-end torque. But overall if you enhance the exhaust to give better outflow, I'm told you'll need to look into the intake - to make sure it's properly improved too - else more going out but not enough coming in. Also, if you decat, better be careful of the O2 sensors frequently found in new car cats - can really screw up your ECU if not properly put back. Link to post Share on other sites More sharing options...
Dualie Clutched July 13, 2003 Author Share July 13, 2003 I'm in fact looking for improvement in low-mid torque/power. High end doesn't really interest me When I fix in a straight thu muffler in my previous car, my low-end suffer like hell. Went back to stock within 1 month I've already got a 3.5" pipe feeding to my airbox (stock box opening is abt 2"). Still insuffucient? Thank you Keat.. Link to post Share on other sites More sharing options...
Saaber Neutral Newbie July 13, 2003 Share July 13, 2003 If low end is what your are looking for then you should be improving the torque in the lower rpm....and a low pressure turbo setup would be perfect for you... Link to post Share on other sites More sharing options...
Modeldriver Neutral Newbie July 13, 2003 Share July 13, 2003 Not sure about the sufficiency of 3.5" vs 2". Might depend also on the air coming in - e.g. heard people who tried SRI generally lost power across the low/mid range too. Most cars unfortunately with problem in low/mid torque would be hard to fix - someone suggested these two possibilities - 1. lighter rims - go for as light as you can - but these'll cost $$$$ 2. do exhaust wrap/thermal paint - believe it ranges from $180 to $280 depending on your engine layout Link to post Share on other sites More sharing options...
Dualie Clutched July 13, 2003 Author Share July 13, 2003 (edited) What's your opinion of mod that will improve low-mid power/torque? Actually the option of getting a LPT did cross my mind Maybe those turbo from k-class cars. Anyway, guess I'm limited to whatever bolt-on mod that I feel is useful and let my tuner do whatever magic with my piggy-back can liao. Thank you Keat.. Edited July 13, 2003 by Dualie ↡ Advertisement Link to post Share on other sites More sharing options...
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