From what I've seen and read, 2.25 is usually for NA applications. Go 2.5-3" if you're going turbo.
__________________ 2007 NBP Fit Sport MT Honda Floor Mats || Honda Cargo Net || 35% tint || custom CAI || Blox shift knob || LED dome + cargo lights || Megan axle-back || Zeta dead pedal || "Dirty White Boy" air freshener :-D
guys 2.5 can flow up to 400 hp. 2.25 would be more than enough. I would be inclined to think that you could even reach 200 hp with 2 inches like the spoon or a spec
first of all, i just wanna know what he's talking about in size, intercooler piping or exhaust piping, it wasn't really clarified. In either case 2.5 inches should be more than enough, intercooler side wise, the extra volume could cause a little lag for turbos, same could be said about having a big frontmount intercooler as well
__________________
~Sport 08 BOM M/T~
Current Mods: Custom homemade intake, Progress RSB, Window visors
Future Mods: Custom turbo Kit??!?!? maybe? suspension and rims
wants: CF HOOD AND HATCH
Does anybody know what the I.D. is of the stock exhaust system?
What is the I.D. of the outlet/down pipe on both kits?
What dictates the optimum diameter piping for exhaust flow of an internal combustion engine, power or displacement?
I'm thinking 2" will be just fine for my little 1.5 that is well under 200hp.
I don't want to be associated with the "fart-can" crowd.
__________________
'08 Fit Sport
HKS Super-Hybrid filter, MFactory magnetic drain plug, HKS Hi-Power muffler, tinted windows
'90 Nissan 240sx sold but in good hands 2008 60,000+ miles on SR20DET by me.
'93 Nissan sentra R.I.P. Hit by 90 year old in 2002
'93 DelSol SI Sold 2002 200,000+ miles
'83 Prelude RIP 1997 200,000+ miles
I believe the factory exhaust is 45mm. That is 1.77 inches.
50mm is 2" and is plenty for a 1.5 liter under 200hp, turbo or not.
This is my Honda Fit, not a race car.
That said,I think I will go with:
T1R B-Pipe and a custom Magnaflow 2" painted black similar to someone else who had their system made by LHT Performance.
The HKS turbo kit and a light black coat on the intercooler.
Retain factory wheels
Upgraded shocks and keep the stock springs as they are.
Strut-tower braces and upgraded sway bars, if available.
*** I want nice flow, minimal sound, stock appearance, and just enough power for my
driving.
I miss my '90 Nissan 240sx coupe but I don't miss the transmission and other headaches.
__________________
'08 Fit Sport
HKS Super-Hybrid filter, MFactory magnetic drain plug, HKS Hi-Power muffler, tinted windows
'90 Nissan 240sx sold but in good hands 2008 60,000+ miles on SR20DET by me.
'93 Nissan sentra R.I.P. Hit by 90 year old in 2002
'93 DelSol SI Sold 2002 200,000+ miles
'83 Prelude RIP 1997 200,000+ miles
2.25 or 2.5 for turbo?
GD3 Squad Member #72 
Linear Mode
