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Message started by danroot on 05/14/09 at 17:55:08

Title: performance exhaust
Post by danroot on 05/14/09 at 17:55:08

hey, its time to replace my exhaust and i was looking at 5 options. for some frame of reference im eventually getting the performance carb, cam shaft, etc. so im looking for the best performance exhaust.

in what order would you guys place these choices from best to worst:

1- raask drag pipe

2- supertrapp megaphone series

3- jardine slip on

4- some sort of harley muffler

5- leave it stock.

i like the looks of diamond jims set up, but he changes it so darn much it would be hard to keep up with him. i dig the raask and the supertrapp sound bites on youtube, but no perormance notes are mentioned.

any help would be appreciated.

Title: Re: performance exhaust
Post by rigidchop on 05/14/09 at 18:10:35

the only performance exhaust is the supertrapp, its probably the best as well, completely tunable. the others are pretty much for sound. although you may see an increase in performance from them, it probably won't compare to the trapp.

Title: Re: performance exhaust
Post by seviersavage on 05/14/09 at 18:17:39

trapp, like Rigid said it's tunable. I have the vm carb and will also get a cam. I just put a trapp on last winter and really like it.
Seviersavage

Title: Re: performance exhaust
Post by danroot on 05/14/09 at 18:37:36

does the supertrapp slip on? would it benefit from a larger header?

Title: Re: performance exhaust
Post by verslagen1 on 05/14/09 at 18:48:24

from best to worst:

1- supertrapp megaphone series

2- some sort of harley muffler

3- custom longshot pipe

4- raask drag pipe

5- leave it stock. (you got to be kidding)

Title: Re: performance exhaust
Post by danroot on 05/14/09 at 18:55:28

so nobody likes the raask? is it purely for sound?

Title: Re: performance exhaust
Post by verslagen1 on 05/14/09 at 18:56:25

It's twice the cost of a supertrapp

Title: Re: performance exhaust
Post by danroot on 05/14/09 at 19:01:32

does the fact that it also replaces the stock header do anything for performance? i recall someone mentioning that a new header would help too.

Title: Re: performance exhaust
Post by bill67 on 05/14/09 at 19:28:23

With the stock muffler you want lose your low end power.

Title: Re: performance exhaust
Post by rigidchop on 05/14/09 at 19:31:08

i think the rask does come with a larger dia. headpipe. probably not needed unless you have some type of headwork done, cam etc.

Title: Re: performance exhaust
Post by 12Bravo on 05/14/09 at 20:06:56

2B2E213D20203B4F0 wrote:

does the supertrapp slip on? would it benefit from a larger header?

Yes it slips right on. bike sounds and performs better.

Title: Re: performance exhaust
Post by diamond jim on 05/14/09 at 20:10:58

64616E726F6F74000 wrote:

... would it benefit from a larger header?

No, a larger diameter header would hurt performance.

Title: Re: performance exhaust
Post by Max_Morley on 05/14/09 at 20:20:41

Original RAASK were a double wall straight pipe with a baffle and packing of sorts. It was noisy for sure and I ended up using it for a header for HD FXD/F mufflers that I got from a HD shop. Worked great for years, then I ended up blowing the center baffler out of the muffler and when I went to change the muffler discovered the header pipe inner tubing had also burned through and that explained the discoloration of the header. I went back to a stock header and the other muffler of the set. The new muffler on the RAASK web site seem to be a head pipe with a variety of muffler? pipe options. I got mine used for 1/2 of what the guy paid for it. Savage Greg has one and is thinking about a muffler on the end as he is tired of the noise, he wife runs a ST on hers and he likes that. I've got the Aluminum ST designed for a Honda XR500 4 stroke on my Savage tug and it seems to work fine, the inlet is actually bigger than the stainless long taper ST for the Savage. To my worn out ears the best sounds comes from a HD FXD muffler with center baffle, HD muffler are made of heaver material and don't ting like some of the thinner stuff does. Max

Title: Re: performance exhaust
Post by Wolf on 05/14/09 at 23:25:39

I have the Raask 60mm Dragpipe and while expensive (shipping gets ya), is kinda exclusive... very well made. When I first installed, the bike definately felt livelier ... and lighter! really showed me that I needed to do the jets! Pretty cool backfires! hehe

Now the Raask has a separate header and you can select 4 muffler types. The Dragpipe and the newer 3 mufflers (quiter - bigger baffles). Pretty cool!

I in mod overkill mode at the moment, will thumpity thump report in a months time... or so :)

Wolf :D

Title: Re: performance exhaust
Post by LANCER on 05/15/09 at 05:10:54

It is my understanding that the Raask header has a 1.5" ID on the double wall pipe. That is probably best for a stock or slightly modified engine. My header has a 1.65" ID and is coupled with a R&D muffler made by Cone Engineering (for a company called Evolution Air I think) a few years back which was being tested for use on the big engine harleys (1550cc at the time, so 775cc per cyl). As far as I know the design never made it to production. Anyway, it is a terrific performance muffler; probably a bit on the loud side for many folks but the thing works well in conjunction with the larger header on a modified engine.

Title: Re: performance exhaust
Post by LANCER on 05/15/09 at 05:13:41

272A25282E39797C4B0 wrote:

Stock header has 1.3" ID...very small for a 650cc jug. Sporty's with 440 or 600cc jugs use 1.75" OD (or 1.6" ID) headers.
It is my understanding that the Raask header has a 1.5" ID on the double wall pipe. That is probably best for a stock or slightly modified engine. My header has a 1.65" ID and is coupled with a R&D muffler made by Cone Engineering (for a company called Evolution Air I think) a few years back which was being tested for use on the big engine harleys (1550cc at the time, so 775cc per cyl). As far as I know the design never made it to production. Anyway, it is a terrific performance muffler; probably a bit on the loud side for many folks but the thing works well in conjunction with the larger header on a modified engine.

Title: Re: performance exhaust
Post by diamond jim on 05/15/09 at 05:34:32

A slight increase in diameter of the header pipe would help with a an engine modded for performance. Usually the best diameter is a little narrower than most people would think is best. Your 1.65" diameter header makes sense whereas a 2" ID header would be too big. I think about 2/3rds of the exhaust performance is determined by the header ID and header length with the rest of the exhaust system/muffler providing the remaining performance.

Title: Re: performance exhaust
Post by marshall13 on 05/15/09 at 10:46:33

remember, this engine is 1/8 of a 320 cubic inch v-8, so examine the headers designed for say a mopar 318, or 340, or a chevy 327.... smaller primary pipe diameter(headpipe on the bike) gives better scavenging at lower revs, larger better at higher(the higher velocity through the headpipe gives the exhaust gas a higher dynamic inertia, thus increasing the venturi effect on both the intake valve, and the tail end of the exhaust stream).... so what rev ranges do you run at mostly? with the stock iggy box set to retard your spark at 6000 rpm or so, we can assume our powerband will be between say 1500 and 6500 rpm max.... what size primary pipe do the race boys run on smallblock v-8s in that rev range? 1 1/2 inch.... 1 1/4 for say a mopar 270..... if you're a redline maniac, and run high revs most of the time, then a larger primary will be a better compromise (1 3/4 inch).....but, the bottom end of your curve will lose torque, because of the 16% greater cross section of the pipe(lower velocity stream)..... clear as mud now, huh?...lol

Title: Re: performance exhaust
Post by LANCER on 05/15/09 at 19:14:51

24283B3A21282525787A490 wrote:

Absolutely :)

Title: Re: performance exhaust
Post by thumperclone on 05/15/09 at 19:23:16

i couldnt find a super trapp for the ls on their web site when i used their find my exhaust feature..
but i aint givin up my hardkrome slash cut either...

Title: Re: performance exhaust
Post by danroot on 05/15/09 at 20:22:52

http://www.supertrapp.com/product_sections/detail.asp?CatID=14&ItemID=728-50650

theres a site selling for 270 if you do some searching

4559445C415443525D5E5F54310 wrote:

i couldnt find a super trapp for the ls on their web site when i used their find my exhaust feature..
but i aint givin up my hardkrome slash cut either...

Title: Re: performance exhaust
Post by LANCER on 05/15/09 at 21:21:27

5E425F475A4F58494645444F2A0 wrote:

i couldnt find a super trapp for the ls on their web site when i used their find my exhaust feature..
but i aint givin up my hardkrome slash cut either...

The Hard Kromes are very good; very good air flow and great sound.