Non-Subaru but school me if you know....H pipe vs X pipe

I'm planning on doing catless headers on my M3 and then a Topspeed tune :wiggle:. I've been looking around at mods and I don't think I'm gonna do catback exhaust because I want to keep the car quiet. In stock form the car has H configuration.

What would the benefit if any of going with an X pipe be? I hear domestic guys talk about X pipe all the time. Stay H or go with X pipe?

 

I know part of the idea is smoother flow characteristics for obvious reasons. Smoother flow while still benefiting from the exhaust scavenging. Im unaware of other benefits if any exist and/or if it is actually worth it on your car/hp.

 

Yeah if it isn't worth anything I won't worry about it.

 

On my mustang an xpipe made 12 more whp than a hpipe.....and it sounds better

 

Thanks Matt. I think I'm gonna do catless headers and Xpipe with no resonator. Hopefully will net a deeper exhaust.

Many M guys whine about rasp......my deaf self can't hear or distinguish exactly what they are whining about.....lol.

 

Ah the fun of modding a NA motor. Tons of money for little gains.

 

????

Headers are $75. Possibly all I'll have in this setup plus tune unless I do x pipe. More research shows the stock H configuration nets more low end tq but that is subjective.

I'll likely end up with 20-30 more hp.

 

I remember spending quite a bit of money on my 300zx and getting very little to show for it. WHP per dollar spent is definitely more favorable on a forced induction car.

You really think you will pick up 20-30 whp with just a few exhaust modifications?
Also are headers really only 75 for an M3?

 

+1 for the sound


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Unless it's a domestic v8

 

just copy this...

http://www.youtube.com/watch?v=QT3LrVh5WRE&feature=related

 

Being an inline-6, I don't see how an x or h pipe would do anything for your car unless you have a complete purpose built exhaust. I suggest you get with Dr. Gas as they are the ones who developed the X-pipe for ASSCAR.

 

Of course when you add a Topspeed custom tune. Doug is averaging about 20 hp gains on every E46 M3 he has tuned.

And yup $75 for a set of great condition used headers.

 

Wrong m3. Mine is inline 6 or better known as e46 m3.

 

I thought you were talking about getting rid of the M3 recently?

 

I changed my mind as usual. I'm happy with this car and until it starts giving me problems I'll keep it.

 

that happens when you start modding it

 

Yeah on the engine. Exhaust and a great tune.....no. :|

 

hence START.....

 

Bump