Ebay headers, + freeflow exhaust = loud ass mofo

[windsor318is]

unless you plan on boost, stay with stock downpipes/cats/resonators.

To posters above comparing sound of their 325i with original m20 to m/s5x swaps: that's 9:1 vs 10.5:1 and 2valve vs 4 valve per cyl = big difference in noise

its going to be supercharged, but i guess i can swap out the cats at the same time.

[static]

how loud am i with.....ebay headers, 0bd1 m3 cats, and AA cat back? im thinking of loosing the cats and getting the supersprint center resonator section to replace cats..what do you guys think?

unless you plan on boost, stay with stock downpipes/cats/resonators.

To posters above comparing sound of their 325i with original m20 to m/s5x swaps: that's 9:1 vs 10.5:1 and 2valve vs 4 valve per cyl = big difference in noise

[windsor318is]

how loud am i with.....ebay headers, 0bd1 m3 cats, and AA cat back? im thinking of loosing the cats and getting the supersprint center resonator section to replace cats..what do you guys think?

[RickSloan]

some of those bends cant be avoided... it gets ugly around the trailing arm and unless you want to scrap on everything they gotta be there...

[Farbin Kaiber]

Any plans to post a sound clip?

[golde30]

good info. i will have to look into replacing this muffler, and getting some nicer bends on the pipes. i was looking at the piping, and the shop i used made some ugly ass bends.

[etxxz]

^^ its two people on borla's (40980 $175MSRP) with nearly stock sounds and screams up to...my car sounds waay to sexy period. look into it.

[JGood]

It's the magnaflow. I have those headers on my 325is, into single 2.5", magnaflow cat, to a Borla universal straight-through muffler. It's quiet as stock at highway cruising, and has a awesome scream at higher rpm's under load. My friend put a magnaflow on his otherwise stock 325e and it was so loud just cruising around you couldn't hear yourself talking...

[kylebes1]

I had a single 2.5 inch all the way back to one of the nice looking SS Magnaflow one in two outs... that was so freakin annoyingly loud.

just add a resonator or something after the cat... and the cat will not affect the sound.

[RickSloan]

roomates got 2.25 duals straight back to a magnaflow dual in dual out 3" no cat. Loud as HELL!!! but you get used to it and it sounds mean. Has a little resanence (sp) at around 2K to 2500 but other then that it roars and sounds muscley at an idol...

mines a single 2.5" straight pipe, thrush glasspack in place of the cat, to a crappy OBX Single in dual out muffler (glorified tip). Its loud but not nearly as loud as my roomates. I think its a great sound, idols nice, gets loud, and has nice back pressure pops when i let off the throttle.

have vid with sound if anyone wants to hear

[etxxz]

my resonator must be atleast 18" long and i have an expensive ass borla muffler in the back...my s52 sounds like a stock M20.... untill it hits 4k, then people move outa the way.

[drifty340i]

Just put a decent resonator in behind the rear muffler

[e30polak]

u think that's loud?! i was running 3" with just a high flow cat and a vibrant muffler at the end...now i put the biggest muffler i could right after the cat: 24" accelerator muffler, it's fucking huge...now the exhaust is almost perfect, she purrs like a kitten when cruising, but when i punch it it's still fuckin aggressive. i need to get rid of the p.o.s ebay turbo manifold i'm using as a header and get a nice set of headers, then switch to 2.5" piping all the way thru.

[erik325i]

Why did you go from dual-single-dual? Why didn't you stay dual all the way back?

-Erik

[matt]

Spinny muffler is really the way to go...