Been back and forth with exhausts for a few years now. Giving it another shot in a few days. Tired of the thing being so loud, it's not super loud and it is actually really deep. (I'll post sounds next week sometime of the two) Used to run (everything 3inch piping) 4-1 headers, a highflow cat, into a moroso spiralflow muffler/resonator, into a dynomax welded sdt muffler but exhaust shop welded things bad and my dynomx sdt muffler cracked at both inlet and outlet welds. Sounded great to me but that system got shot.



Currently I'm running (everything 2.5inch piping) 4-1 headers, no cat (register in emission-less county), two aero turbine resonators, one aero turbine muffler, into one moroso spiralflow muffler/resonator, into pacesetter resonated exhaust tips. It's better but still looking to kill the drone and loudness more but am getting tired of experimenting with my exhaust. Wouldn't be bad if I had a dyno I could use anytime.



So from what I seen a stock system runs, downpipe, cat, mid muffler, muffler.



I'm thinking I should keep close to that because currently most of what I have it 2.5inch piping all the way through with 0 to little backpressure parts. I feel I'm not getting enough backpressure and my cars performance is suffering.



My 1997 tiburon is N/A so I know bigger is definitely not better.



My new set up I'm thinking is the 4-1 headers, downpipe, no cat but in place of that I put the moroso spiral flow muffler/resonator since on stock that's the first spot for a backpressure type part. How the moroso is made it spirals around the muffler and has a small straight tube in the middle. After that I would go aero turbine resonator then another aero turbine a little further down because they don't make one big resonator, then lastly into and out the back a dynomax super turbo for a little more backpressure. Lastly go with more resonated muffler tips.



What do you all think? Thanks for the looks.

 

size really dont make better sounds...



Iv had 180Bhp from 1.7Inch OEM Uk 1.3 Accent Exhaust on a beta.



a tighter pipe sounds more.. Active.. bigger pipe sounds more deep and lazy..



Really up to taste.

 

4-1 Headers is somthing else... 4-1 headers are great for High RPM. Beta engines are pretty lazy up top compared to mondern engines.. My alfa 2.5 V6 revs to 7400Rpm from factory.



4-2-1 Headers is good for power.

 

your alfa revs that high.....to make 15 more hp than a beta



out of a v6



i wouldnt call that modern

 

You do not need backpressure. You do not want backpressure. You do not understand backpressure. Backpressure is bad. Only.



What you want is velocity. Not just more, but the *proper* velocity. You want the primary tubes on the header the right length and diameter for efficiency in the range where you want most power, and then the collector at the right spot so it doesn't kill the scavenging effect. Then the rest of the pipe, you want small enough to promote good velocity out the tail pipe but not so small you get . . . backpressure!



This is a moderately complicated set of calculations almost nobody without a fat team sponsorship for their gen-u-wine race car bothers to do. For the most part, 2" to 2.5" piping is plenty for a N/A 2L engine, and if you don't like the sound either wrap the header, change the muffler, or alter the gearing so the engine operates at a different speed.

 

Just to sum this up, I have a custom header, and a full 3" Exhaust, well Turbo back( A Turbo is the BEST MUFFLER money can buy) and just a Genuine Hks high power muffler. super quiet and zero highway drone! Very good flowing and very easy on the ears! Also sounds like a straight up Subi

 

Thanks everyone for the input, heading to the exhaust shop tomorrow morning. Stocker, again as always thank you and got it don't want backpressure. You explain things way better than even the guys at the exhaust shop, I ask best way to set things up and their like I just weld. I then slap my forehead, hope my instincts serve me right and then ask them to weld it that way I see most logical. With this input, it will help greatly.

 

Ended up finishing up the exhaust work and I'm very pleased with the tone now and no drone on the highways anymore. Loud when you punch it but that's fine by me. So set up was 4-1 headers, replaced cat with moroso spiralflow, 2 aero turbine resonators, axle pipe, dynomax super turbo, headman headers red hot resonated dual tips. All 2.5inch piping.

 

sounds like a labryinth more than an exhaust system-... butt dyno gains or losses?