Modifying rear Valance panel. Manta Exhaust?

I am looking at buying a Manta exhaust for my car. My car has 1 outlet now, the Manta has dual outlets. To do this I will have to modify (cut) the rear valance panel!!!!! Has anyone had to do this before?

Is it worth it? My car is in average shape so show quality is not important.

Does Anyone here know about the Manta exhaust? It is part # PEL-911-MON-01 in the pelican parts book.

Thanks
Shawn

The fitting processs will be most easily accomplished with the use of a plasma cutter or pnuematic cutoff wheel.

The simplest method would be to remove the valance panel from the bumper first. You may need to remove the bumper completely because the #3 phillips screws rarely come out without the use of heat(Oxy./Acet.)from the interior surface area of the bumper.

After removing the valance, re-attch bumper. With new muffler installed completely, it now gets into basic geometry. Partially attach valance to determine approximate area which will need to be cut. Always cut long as its easier to take more off than to add more after cutting. You will need to remove and re-attach the valance several times to get it right. Use the cutoff of wheel for final finishing and trimming of cut area.

It's not rocket science but anyone with a compressor(or plasma cutter..stretch) and some general mechanical know-how can do it.

Personally I think the upgrade looks great and always remember the easiest way to get it done in a hurry is to take your time. Good luck with it.

Rich

Thanks

It sounds pretty simple.

Have you ever seen or heard of these exhausts? I'm wondering how good they are?

Shawn

shawn-
i don't have a clue abot manta but whenever i get a chance to brag about my B&B system (here goes).....my B&B complete package, including stainless headers, exchagers, muffler, new oil lines and four inch dual tips was beautiful when it arrived, the welds were perfect and the stainless steel was gorgeous....the sound is what they call "intermedite," and it sounds awesome! the rear valance had to be cut, and was done by the guy who installed the complete system...i know he took the valance off to do this, and he reported it was very easy(of course he's a pro with porsche)....good luck! i'm very pleased with B&B's product, and will recommend them anytime over any other company!



------------------
jeff
84 carrera cab

Thats all cool if you want ot spend $2000+ on exaust Jeff.



------------------
Leland Pate

___79 SC Targa

OK, OK, OK. . .
So I'm jealous. . .

My car had a Manta exhaust on it when I bought it ... replaced it less than six months later with OEM, because of terminal rust! You want to know what it sounded like ... just think about Dustin Hoffman in that Alfa spyder in 'The Graduate' !!! Well, maybe not quite that bad, just had to get a little humor in!

------------------
Warren Hall
1973 911S Targa

[This message has been edited by Early_S_Man (edited 04-10-2000).]

Thanks everybody for the replies

Warren is it a real bad, loud sounding system? The set-up on my car right now is shot, and is terribly loud! That is why I need to replace it, I have a lead on a Manta one really cheap so I am thinking of getting it to quiet it down.
You have a lot of good replies on this system so do you personnally recomend this or NOT AT ALL?

I wish I could go to a complete new system like you did Jeff......But its the wife and the purse strings thing.

Shawn

Shawn, No, actually it isn't too loud, and just a little bit 'buzzier' than stock, but, for the most part, OK. It's OK, if the price was right for your budget, but personally I prefer the OEM sound. Unless, of course, I'm allowed to run my open dual 5" megaphones with crossover pipe and diffusers at the autocrosses!!!

------------------
Warren Hall
1973 911S Targa

I have a glasspack exhaust on my '76 911S. It came with the car when I bought it. My parents aren't very happy with the loud exhaust, and they want me to get something that's not as loud. I've been looking at the Manta and Bursch exhausts, probably the two cheapest ones. Does anyone know which one has a "mellow" sound and which one improves performance(even by a little?). I like the dual tip look of the Manta, however but a Bursch with dual tips(which is not available) would be good too. Thanks,

Jeff
1976 911S

I put a Manta on my '73T with Webers. I LOVED the sound it made. The dual tips are baffled and create a nice tone. The down side is that they do rust. I did not modify the valence (seen too many cars with a hole for every exhaust it had over the years). I modified the Manta. Cut off the tips, moved them to where I wanted them to exit, and attached pipe to make it work. Sold the car a year later but got the exhaust back at a swap meet after the moron trashed the car.

If you want to make the opening look similar to the original a couple of tips. After the stock muffler is removed, hold a stiff piece of paper behind the opening of the original and trace the dimensions of the opening to use as a guide for the new opening. Cut the opening smaller then the tracing to allow you to bend the steel at a 90 degree angle to replicate the original opening. (Look closely and youll see what I mean). Gives a finished edge rather than a cut edge. I have seen too many ugly openings that look like they took no planning. Spend a little time to make it look right. Good luck.

Shawn:L

One other thing you might want to consider is buying a used rear valence, and coring that out with two holes through which to fit the pipes. This way you will retain your "original" valence for future replacement when it's time to sell the car, and this way you won't have the swiss cheese look that RarlyL8 is talking about. I did this very thing to mine for the sport mufffler, and it looks terrific, almost "stock". A paint shop painted it after we cut the holes; nice and neat!!!!

These rear valences should be cheap at swap meets and auto dismantlers.....Andras

Shawn:L

One other thing you might want to consider is buying a used rear valence, and coring that out with two holes through which to fit the pipes. This way you will retain your "original" valence for future replacement when it's time to sell the car, and this way you won't have the swiss cheese look that RarlyL8 is talking about. I did this very thing to mine for the sport mufffler, and it looks terrific, almost "stock". A paint shop painted it after we cut the holes; nice and neat!!!!

These rear valences should be cheap at swap meets and auto dismantlers.....Andras

shawn-
you can find used exhaust systems out there including B&B....my personal take on spending coin for my porsche goes like this....spend a little more now and save more in the future when you can avoid replaceing the part you only replaced a year or two before because of rust or something worse.....since porsche used the highest quality parts straight from the factory, i try to upgrade, if my pocket book allows it at the time, with the best part for my current situation....obviously everyone is at a different junction in the road when it comes to finances....good luck and if you can live with your current exhaust system until you've stuffed your piggy bank....it'll be worth the wait it in the long run! (that's what i had to do) ;-)
-jeff

[This message has been edited by jeff bryant (edited 04-11-2000).]

By the way - I purchased two new Mantas at swap meets last year for $20 each. This would get you by until you're ready to drop a grand on a stainless unit, No?

Thanks again everyone

Yes I am only spending $60 for the Manta, so I will probably use this until I can "stuff the pocketbook"
Mine is realy bad now so I think I might go with the quick fix and spend more later.

Great idea on buying a used rear valance, I will probaply do that too.

Shawn