[Lim Yong]

Hi all,

I recall someone deleted the rear muffler to reduce weight....Bob Blackwall?

Something like 30 lbs. Any comments on the the sound and effect on handling?



I am thinking I like to do the same as the Tip is 66 lbs heavier than the 6 speed.



I already removed the spare tire. Anyone know the weight off hand?

thanks

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[94SilverCab]

RS Barn Cat back reduces weigh by about 30 lbs.



No one that I know of has "Deleted" the muffler for both noise and back flow reasons (even full on race cars)



Regards,



Jay.

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[flash]

lol - wow - that one is almost as much of a can of worms as conversations about chips



weight savings is almost always good, but watch out for how much you take out of the rear of the car - granted, you have 66lbs of transaxle weight to deal with, so you have a bigger margin back there, but it is easy to upset the balance - i removed 240lbs from my car, and most of it was in the rear - i had to move the battery to the trunk to offset some of that



whatever you do, be aware that the exhaust is very touchy - things one would normally do to get power do not work on this car - both pete and i have spent at least 10 grand each trying to find hidden power in the exhaust - i have been through 15 different systems myself - while sometimes adding a couple of horsepower up top, flow improvements almost always equate to torque loss - there are some new recent "developments", but they aren't quite ready yet for the market, and won't make any difference to a large number of people



to date, the only system being marketed that shows no losses is the RS Barn system - all others out there have losses somewhere (many of them claim gains, but show no data to contradict our data or to indicate where those gains are) - deletion of stock components creates losses too



i believe bob did indeed remove his rear muffler - as i remember, it's pretty loud compared to stock, but wasn't obnoxious



the spare, jack, tools and compressor together weigh 38lbs - i didn't weigh the spare by itself, but i'd guess about 28lbs

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[bob blackwell]

Yes, I removed the rear muffler and had two straight pipes put in to extend out to the rear of the car with chrome tips welded on. The weight loss was about 30 pounds and the sound is a deeper, more powerful sound than stock. Not too loud and not booming or raspy. Just sounds like I think a sports car should sound. No ill effects for the last five years. Come on out to the PCA Escape in September and hear it for yourself! Good luck, Bob Blackwell.

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[flwbyu]

I will look forward to checking that setup out myself when I am at the PCA Escape in September. It sounds very interesting.

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[Lim Yong]

Hi all,

thanks for the info....so with the removal of the spare etc. and the muffler, I lose 68 lbs which makes it close to the 6 speed with the same balance.

I gain the balance (like the 6 speed) but may lose some torque/power somewhere. Sound will be sportier but not too loud. I'll keep everyone posted

when I do this.



Interestingly, this started when I removed the front bumper brace (I think Flash did this) and found the balance for the front to be light(er) during

tight cornering (good) but not so good on long sweepers (there is a 270 degree sweeper on the way to work) and I can definitely feel the back more,

I thought a tower brace can help tighten the front.



I put back the bumper brace after 2 weeks and figure some weight removed from the back will help with the balance, especially with the Tip, if I plan to

reduce weight in the front at some point.



Bob, wish I can attend the PCA in Sept. a little more difficult living on Oahu though I wouldn't want to live anyway else. But, IT IS AN ISLAND..nice car with

no where to go. <img src="/forum/images/smilies/968/tongue.gif" class="smilie" alt="" />



Those lucky ones who can attend the PCA. Please post your observations...thnaks

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[SpeedRacer64]

Bob....did you maintain the same size pipe?



LuKe

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[bob blackwell]

Luke, yes, we used the same size pipe as the two pipes going into the rear muffler. Just cut them off about three inches in front of the muffler and welded in new pipes the same size to extend out to the rear. The muffler shop has a machine which can expand one end of the new pipes to allow them to fit over the old pipes. No leaks, no vibrations, and a nice, deep sound. Good luck, Bob Blackwell.

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[Ryan]

Funny thing about the 968 muffler...it did not have much to do. If any body has removed the mid muffler and left the rear on, there is a huge increase in sound with the rear left in place. For as big and heavy as the 68's muffler is, it does'nt do very much muffling.

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[Lim Yong]

Good to know...thanks <img src="/forum/images/smilies/968/blink.gif" class="smilie" alt="" />

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[Lim Yong]

Hi all,



So I finally did it. deleted the rear muffler, the shop put in a Y-pipe that connects to a 2.5" pipe connected to the original exhaust tip.



So, with the removal of the muffler (20 lbs), spare wheel (25 lbs), tire pump (4lbs) = 49lbs from the back. Add back about 3 lbs for the pipes=about 45 lbs

removed from the back.



Sound= nice and deep outside of the car from idle, a little too loud (IMO). In the car (windows closed), resonance from 1700 rpm til after 2000 rpm and again after 3000 rpm.

so I added rubber grommets to attachment points of the rear heat shield which helped with the resonance (since the shield is easy to get to with only the pipe there). I plan

to add more to the other heat shield(s) if i can, to see if it will help more.



normal cruising on the highway (steady rpm) is actually pretty quiet, exhaust sound traveling backwards away from the car maybe? step on gas and I can hear the exhaust

growl. pretty nice......have not really tested to see if there are improvements in the car's pick up. seems to breath easier after 3000 rpm though.



gas from stand still and it gets a little loud as people definitely notice. not as nice as I don't need more attention with a red car.....



cost, $250. To be added to this yr's car expense.



conclusion, I like the sound of the exhaust as it covers the road noise which I really dislike so i can recommendation this mod.

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[flash]

you may well find that what seems "loud" but not "too loud" gets annoyingly louder as time goes by - the enthusiasm from a new mod, and the sensations of the sound, seems to soon turn into a bothersome annoyance awfully quickly



i've been through this particular one now way too many times - almost every time it "seems" cool - then i drive it for a bit and i'm back at the exhaust shop for another try - i've even gone from the extreme of loving it to hating it



maybe i'm just getting old - i used to drive cars louder than this



give it some time though and see what you think - you probably do have a bit of freer breathing up top, but i suspect there is a bit of low end loss - that would bug me

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[PorscheDude]

Heck even my B&B seems "loud" after all these years.

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[SILVY968]

Has anyone else removed the front baffle piece and basket in the resonator? I made the change to the exhaust and have felt no reduction in torque but a nice increase in lo tones without a significant increase in volume.
I did not think that it was very noticeable but others immediately hear the difference.
Brian

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[flash]

it has been done by a guy down here - i have driven that car with that done - i was not super impressed - there was a bit freer revving at about 5k, but there was a noticeable dip in torque at about 2.5-3k - it wasn't huge, but it was there - as long as you kept the revs up, it was fine, and the tone was improved

a lot of work though for less than optimal results

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[Lim Yong]

Hi all,
thanks for the feedback..i kept the original muffler just in case. the shop also mentioned they can add a free flow but I wanted to reduce the weight in the back
as much as possible.

I recall the resonater restricter removal thread, very interesting but too much hassle for me. i need to work on other stuff. the speedometer stopped working and
the gas gauge is not reading properly.

will update with further observations when i get a chance to push the car a little.

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[flash]

it is amazing how many people play with the exhaust - i am still messing with it, searching for that last little bit more - i also am trying to reduce emissions that the aftermarket cats just don't handle - you'd think by now i would have given up though

your gauge issue is very likely a loose connector or bad ground at the dash

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[Lim Yong]

Hi bob, as always, thanks for your help......big plug for your assistance with the tech art splitter info and while I'm at it.
any thoughts on 2 piece brake rotors that works with the stock calipers? that may be a nice group interest.
Anyhbody??

hint, hint........

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[flash]

working on it - it's back a couple of projects though - once i get those wrapped up, then i am onto that - i am going to need rotors soon enough, and i want aluminum hats

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[DaveN]

Off topic but explain "2 piece" brake rotor. Obviously not 2, 1/2 rotors cuz I don't think the glue would hold [img]style_emoticons/<#EMO_DIR#>/tongue.gif[/img]
Do you mean the disk itself is attached to an independent hat?

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