so it isnt a good idea then.....?

 

It's better IMHO to have your exhaust the exact same size all the way through. I think it regulates the exhaust flow and helps your engine to exhale better, but I cannot say for sure.

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Yea that!


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yeah but is .25 of an inch really going to make a difference?

 

Yes, the extra .25 inches would make a significant difference in sound, backpressure, and powerband. At least it would if the r18 had any balls...I hate that our cars don't even have enough umph to discard of a 20 year old civic equivalent...

Actually answering your question, though...having a smaller axleback than the rest of the piping will increase backpressure that was initially reduced by changing the stock midpipe to a larger diameter, thus potentially counteracting the purpose of increasing the diameter of the catback...

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ok so ill just stick with my 2.25 axleback and stock exhaust piping then..... save me some cash hehehe and headache...lol

 

Now don't let that discourage you from upgrading your exhaust. You may not get a lot of power out of an aftermarket exhaust, but you will get a unique sound. If it's sound you want, go for it, or better yet, wait till you can afford a full catback from greddy, tanabe, or another reputable exhaust manufacturer.

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Agreed.

My Megan Racing header/exhaust combo didn't add that much power, but it sounds hella good!!! :thumb:

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Going from a larger size pipe to a smaller size would create a potential bottle neck in your exhaust and might cause back pressure issues. Though going from 2.5 to 2.25 inch isn't a huge transition. I personally wouldn't do it.

 

I've had satisfying results with my 09 r18 Megan racing N/A exhaust plus 2.5 in. downpipe. Add to that a Takeda intake, P2R tbs, and NGK iridium spark plugs only improved throttle response. I've really felt the extra torque from the downpipe from 3000 rpm to redline.

 

so if i buy exhaust....i will need to buy the down pipe too?

 

most r18 owners rock the greddy ti-c, looks and sounds good on them.

 

No, and unless you want it loud, I would refrain from getting it...jmho

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magnaflow catback sounds awesome, it is a little on the quiet side but when you hit 3k it is the perfect sound.
once the exhaust is broken in, it is absolutely perfect.

 

so a custom made 2.25 exhaust would be perfect for me then ! i could just snap my dual tip axleback at the end of it and see a difference!

 

Here is why increasing the exhaust diameter really helps. The formula for area of a circle is pi * r^2.
2.25" dia = 4 sq in
2.50" dia = 4.9 sq in (24% increase)
3.00" dia = 7 sq in (78% increase from 2.25")

By increasing the area, it reduces the back pressure, but also slows (and therefore cooling) the exhaust gases. Most stock systems reduce the total diameter from the engine to the tail pipe. Fluid dynamics says that the most efficient way to move fluids (and air) is laminar flow, I'm guessing that is the reason factory exhausts do this.

But, the track and history proves that bigger exhaust in the end is really better.

 

Going with the si axle back.^_^


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I agree keep it the same size ill have to look into the greddy ti-c long as I can get a neo chrome tip ill be happy I just don't want my system load and annoying I had a evo for that

 

Hey, I have a full megan exhaust on mine. Sounds sick :lol: but I even took off the cat since I installed the header pipe on it, does anyone know how to take off the check engine light? Or trick the computer into thinking there's a cat??

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Megan Racing Cat Back System - NA-Type - Import DPS - Stocking Performance Superstore - Price Matching Available - Huge in Stock Selection

anybody rocking this?

 

I'm rocking full megan, except the tip cus somebody stole mine when my car was parked outside :\

 

Hows the sound? Also did you have your car tuned?

 

It was deep, on high rpms it screamed, but that's because I also have the headers on my r-18...and nahh its not tund sadly :\