Generation III External Engine - Most Quiet Long Tubes?
12-11-2004, 08:00 AM
I have a stock cam and the hooker cat back. I'm going to buy lt's and catted y-pipe for my 98 Z28, but I need it to be as quiet as possible because of the european noise levels required over here in Germany. So which brand longtubes+catted y-pipe would you recommend me? Any suggestions?
12-11-2004, 08:21 AM
12-11-2004, 08:30 AM
Long tubes are long tubes in terms of sound. I doubt the brand of LT's make an impact on the volume of the sound (perhaps a bit, but not a major factor).
The quality/characteristic/volume of the exaust note is determined from header collector on back.
Get yourself a catted Y-pipe (any brand) and an SLP Dual/Dual Catback. The Hooker is rather quiet at idle, but screams up top. Another option is to weld a bullet into the I-pipe to supress the sound a bit more on your current Hooker setup.
The crucial components to keeping sound down are cat / catback combo. You may still need to weld that bullet in the I pipe in the end.
12-11-2004, 09:31 AM
get long tubes, catted y and keep the stock muffler.. it will be very quiet
12-11-2004, 11:26 AM
get long tubes, catted y and keep the stock muffler.. it will be very quietI agree, :nod: and QTP LTs with catted Y are a good place to start too. :burn:
12-12-2004, 08:38 PM
sounds good guys thanks :)
12-14-2004, 07:27 PM
Just get LT's, catted Y, and stock exhaust, and get a cut-out.
12-14-2004, 07:38 PM
Kooks is also quiet until you hit it. just put a mufller or two on the set up you will get. that will probably be the only way to reduce sound, as thats one property that a muffler does (or at least some of them)
12-14-2004, 07:40 PM
You ran a 13.96? damn. was it a bad run??
I dynoed 356HP and 375TQ and before that i had 344HP and 352TQ and i ran a 13.15 @ 108 w/2.1 sixty foot
12-14-2004, 07:43 PM
not to be an ass or offend but...a problem with your car may be that you descreened the MAF and the car doesn't have the standard programming for a descreened MAF. Unless the custom PCM tuning included adding parameters for the extra readings across the sensors on the MAF. if you want to know where to get the programming for the descreened MAF you can grab it off of an 02 or later corvette ZO6
12-14-2004, 08:22 PM
Well that bad run was the first and only run I made and it was without the pcm reprogramming. I was unfortunatly too late at the track and they just let me do that one run. So it was very difficult for me to get traction and hooking the car in the right way. My goodyear eagle gs-c tires could not give me traction at all, however I think I have to practice to learn how to hook it up well. For this reason I have recently bought some comp t/a performance street tires and a trans mounted torque arm, hope they will help me out a bit.
Just for your information we do not have kinda good prepared drag racing roads in Germany as you are used to in the U.S. The place where that drag racing event took part is an old airport lane that is no more in use and it has a road grade tendency of 20%. One of my american friends has a stock 2004 Z06 (405HP) and his best was 13.06 seconds in the quarter.
Thanks for the tipps on the descreened MAF tuning sources, Jason at texas speed has changed all the settings to my pcm for my mods including the descreened MAF. I just hope I can pass the emission inspection here with a set of lt's and catted y-pipe and a stock muffler. Well we'll see... :)