[dkaile]

Received some beautiful patches from some dear friends...

My call sign


A beautiful name patch, albeit with the wrong spelling. Hope to get the corrected patch soon...


Cheers...

[dkaile]

Received the COBRA Race Pro Tip Slip-On Exhausts today from Amazon, USA

Nicely packed even though the carton was opened by Customs. Total Custom Duty charged was 4.8k.


The inner packaging was sealed and unopened




The exhausts and the SS clamps. Cobra, USA offers a lifetime guarantee on the Chrome.


The rivetted end caps looks real classy with my studded bike


Attached to the bike myself. A half an hour job.




The sound is really deep grumble, just the way I like it (see video)


Matches the bike perfectly


Here's the BEFORE video with the stock exhausts

http://www.youtube.com/watch?v=V9ryCWiJW-o

And here's the AFTER video. Deep Grumble especially heard over long distances without shattering your ear drums.

http://www.youtube.com/watch?v=ar2dgSWseT4

Total damages were 27k including freight and customs. Quite a good deal I would say for such a classic product.

Cheers...

[ku69rd]

Looks very neat Dheeraj and if I understand these are the slip ons right.
Chrome Finish is again fantastic and am sure in ur hands they will be always shiny.

27K seems to be a very good price when you compare them with the Screamin Eagles.

[Shubz]

Nice job on the looks! however I felt the exhaust was struggling when you revved. Idling still sounded better. Or is it my ear?

On Stock too - when you revved I could hear some phukk phukk sounds.

and what is "Race Pro?" I didn't see anything like that printed on the pack?

@Mahesh - did you notice the same?

Cheers

[ku69rd]

Originally Posted by Shubz

@Mahesh - did you notice the same?

Cheers

Yes Bro, felt the same. Since this is only a slip-on, mechanically there is no change in the ignition/exhaust cycle except for the cosmetic outlook and reduction in body weight making the ride feel more sprightly and faster.
Yes the notes sound a bit strained like being suffocated.

But the looks are simply too good thought.

[dkaile]

Had a nice long ride today and boy oh boy what a sweet sound. There is a definite increase in performance and the bike is lugging much more freely than before. The above videos don't do justice to the sound they make. The Race Pro Technology employed by Cobra in their 4" slip-ons and transferred here into these 3-3.5" slip-on's DOES work. It's just not the sound but the performance and free revving nature of the engine is now revealed which was hitherto hidden in those constricted stock exhausts. The deep bass sound penetrates further. Just to give a example, my neighbours car was now blowing it's alarm siren every time I revved my engine... lolz. Never happened with the Screamin Eagles.

Originally Posted by Shubz

Nice job on the looks! however I felt the exhaust was struggling when you revved. Idling still sounded better. Or is it my ear?

On Stock too - when you revved I could hear some phukk phukk sounds.

and what is "Race Pro?" I didn't see anything like that printed on the pack?

Originally Posted by ku69rd

Yes the notes sound a bit strained like being suffocated.

But the looks are simply too good thought.

Lolz. Here's a write-up from Cobra on their Race Pro Slip-On Mufflers - http://cobrausa.com/inside_cobra/behind_the_scenes/ & http://www.cobrausa.com/h_d_softails...mufflers/6053/ . Hope that enlightens you . The video as I said does not capture the true sound. In reality the sound is just a deep bass based sound and truly music to my ears and this sound was being heard by a friend nearly a km behind me with prominence without disturbing me, unlike the short shots which gets very annoying after a while. One of the best buys I have made in years. Now to add a stage-1 air intake kit and a tune up with our Power Vision to unbolt the many more horses which are lying untapped.

[Shubz]

I still wonder how you get an increased performance with just the slip ons and without any modification to the Air intake and AFR settings. Unless I have missed out on something.

For that matter my video did capture it quite close to reality. And that was some enlightenment to me as I made my buddies listen to the sound using ear phones and in real. So I am still unenlightened about your choking sound sir.

[dkaile]

Originally Posted by Shubz

I still wonder how you get an increased performance with just the slip ons and without any modification to the Air intake and AFR settings. Unless I have missed out on something.

Well if you don't believe what Cobra says on their website, you should at least believe a actual user. Research in depth on the internet and there are thousands of topics eliciting the benefits of free flowing exhausts. Of course adding a heavy breather intake and a fuel map will open things up even more. But just the exhausts alone too add to performance. FYI these slip-ons were completely see through (free flowing) unlike the stocks and even the Screamin Eagles where I could not see light at the end of the tunnel... lolz. You are mistaken about reading too much in the video if you are hearing things there. See it performing actually and you will realise that these Race Pro tech slip-ons do actually deliver great bang for your bucks on looks, performance and sound.

[Shubz]

Originally Posted by dkaile

Well if you don't believe what Cobra says on their website, you should at least believe a actual user. Research in depth on the internet and there are thousands of topics eliciting the benefits of free flowing exhausts. Of course adding a heavy breather intake and a fuel map will open things up even more. But just the exhausts alone too add to performance. FYI these slip-ons were completely see through (free flowing) unlike the stocks and even the Screamin Eagles where I could not see light at the end of the tunnel... lolz. You are mistaken about reading too much in the video if you are hearing things there. See it performing actually and you will realise that these Race Pro tech slip-ons do actually deliver great bang for your bucks on looks, performance and sound.

Sir - don't take it so personal. apple to apple comparison. I put up a video and I listened to yours. The least you could do is post another video. Seeing each others exhaust in person is possible when we meet. I was in NO way comparing your exhaust note v/s mine. They are two different worlds, Slip-on's v/s Full systems. We can debate on performance here even though its a mismatch.

I could see the "end of the tunnel" in the form of a red glow on my buddies SE slip on's :-) May be my eyesight is failing?

So coming back to increased performance on a slip on.

1) Would really love to read the posts on forums that you have researched on.
2) Would you be able to back your claims with data/dyno figures?

Yet again, I implore you not to take it so personal and engage in a healthy debate as there are tonnes of users who would benefit from this discussion.

Apologies if I tread on your raw nerve.

cheers.

[dkaile]

Originally Posted by Shubz

Apologies if I tread on your raw nerve.

Not at all Shubhankar. I am not taking it or comparing it with anybody, least of all your upgrades (I don't know why they came in the picture in this discussion here? Did I mention them?). A full exhaust upgrade will always be better than a slip-on. I was eliciting just my upgrade and though I don't have dyno figures nor do I intend to get them, but as a experienced biker I rely on my instincts, and I can definitely feel the extra surge. These Race Pro tech slip-ons do employ some kind of different technology which makes them better than the plain slip-ons IMHO. Hope to end this discussion here... Please enjoy your upgrades and let me enjoy mine.

[Shubz]

Would love it if you could lead me to those sites which highlight this? Would really help a lot of people who haven't ventured beyond SE or VnH.

Secondly don't you think your bike is now running lean? Did you notice any rise in engine temperature? Any effect on FE?

[dkaile]

Originally Posted by Shubz

Would love it if you could lead me to those sites which highlight this? Would really help a lot of people who haven't ventured beyond SE or VnH.

Secondly don't you think your bike is now running lean? Did you notice any rise in engine temperature? Any effect on FE?

Here are a few links discussing performance upgrades for Harleys. All of them, as you will read, point to the fact that you DO get performance boost EVEN from slip-on exhausts.
http://www.harley-performance.com/harley-exhaust.html
http://www.youmotorcycle.com/faq-how...sportster.html
http://www.cobrausa.com/inside_cobra/behind_the_scenes/
http://www.hdforums.com/forum/tourin...l#post12446776

The bike was running perfect, no back firing, no increased engine temperature. In fact I felt that the bike was running cooler. It is too early to comment on FE figures. In fact the best thing about slip-ons is that you can install them without upgrading your air intake and fuel mixture figures and still get better sound and performance than stock. In fact I used the Screamin Eagles on my Sportster for 2 years without any additional air intake upgrades and got excellent performance. Unfortunately the Screamin Eagles disappointed big time on the Softails.

[Shubz]

Yes sir. You are right. One can use just the slip ons. But had learnt that air intake is constricted compared to freer exhaust causing increase in heat. And bike running lean.

[dkaile]

Originally Posted by Shubz

But had learnt that air intake is constricted compared to freer exhaust causing increase in heat. And bike running lean.

That is more of a issue with full exhaust upgrade without upgrading air intake. For just the slip-ons even Harley Technicians don't insist on the need to upgrade the intake and fuel management system. The stock map has sufficient flexibility to adjust to the added free flow of just the slip-ons. As I mentioned, I have used just the slip-ons for 10000 kms on my Sportster with ZERO issues of heat and bike running lean. If anything my bike ran smoother than many others in my group at the time of its sale.

[ku69rd]

Dheeraj Saab,

What's the weight difference between the stock and the cobra slip-ons?