How did you verify that 17bhp? You guys went for dyno?

You might as well go somewhere else. There are enough people cheated for going to WAI HENG so I hope you're not the next

Is it compulsory to start one? The "cheat" I'm mentioning here isn't about con cases like you presume which would always end up in a dispute thread. I don't stop people from going there but I advice them that this is a crap place to get your exhaust done. If you think it's not then by all means go ahead, no one is restricting you. Of course if it's screwed up after that, don't complain.

I would say product problem mostly but the seller and workers are also dishonest. They are selling cheap muffler at premium prices and it doesn't even last for few months. I had a drop in my top speed - imagine a 2.4 litre car doing 170km/h MAX!

Let's be logical, how can it be 170km/h? If you're saying 200km/h then at least it's more acceptable and besides, it's my car. They have a few different shops with different names.

No, Xin and Wai Heng are the same and Wai Yip is his brother or some sort but both of them are not in talking terms I heard. I've changed everything (all mufflers and piping) in another exhaust shop. Yes, it's suppose to be 200km/h+

I only do that NSE once in a long long while. Normally I'll drive 140-160km/h at max

Nice setup. Is that a new extractor or used?

Of course it would. What's the cause of leaking?

LOL, seriously, I don't really like those "cakap tak serupa bikin" people. I mean, be a gentleman and if cannot do, don't commit. I wish before I go Wai Heng, someone tells me I shouldn't. Hence, I'm doing a goodwill by letting people know my experience there and why they should avoid.

You need to know that the only "real" VTEC are found in Honda Type-R engines. Those VTEC found in City/Civic/Accord are just a marketing ploy (Toyota calls it VVTI, Nissan has got some other names for it - I forgotten, lol). It has the technology but it's not the "real" high revving VTEC engine. Plus, I don't think your VTEC activates at 5k rpm because it's not easy to continuously rev your engine at 5K rpm for all gears. Even my previous ride on K24A, the VTEC might be activated in low 2K-3K rpm's.

You need to sit on a proper Type-R engine to understand what VTEC is really all about and is originally intended to be

There are basically a few different types of exhaust modification in our Malaysian market

Type 1
Ah Huat, Selvam or Ahmad Kedai Exhaust - they will give you their inputs on how they can make your car fly and recommend that you change the extractors, cat, piping, piping diameter, resonators, mufflers (head to tail) without any calculations if it really even work or improve performance. They always claim it does because they want to make money. We often call this "custom" exhaust systems.

Type 2
China made replica exhausts - it's very common these days and you can find all sorts of imitation from the actual product. Obviously China has increase their capability when it comes to R&D (Research and duplicate). It may work very similar to the original ones but the metal/quality of the product is not there.

Type 3
Proper exhaust from tuners (Akrapovic, Eisenmann, Hamann, MHP, Remus etc) which costs a lot more but is guaranteed to work as expected. These companies spend their time researching, designing and doing proper calculation as to how these exhaust replacement would give additional bhp/torque to the car. They are professionals.


So it really depends on what we are looking at. My car is fitted with an original Eisenmann quad exhaust which costs RM7K+ and it does the job. I get a bit of sport sound and I don't lose performance. On the other hand, those custom exhaust would make you lose quite a bit of torque on the low end due to the quad pipes because there's no maths in their design. They just make the quad pipes for you with whatever mufflers and piping they have. This means their muffler is universal, you can have it on a Proton Wira 1992 and also fit it on a Golf GTI or even a BMW E92 335i. The question would be, how much are we willing to spend? Some people doesn't want to spend on premium/proper stuffs but some do.

I am speaking from my experiences because I used to own a Proton Waja, Honda Accord and now a BMW. All of them had their exhaust modded and especially on my Accord, Wai Heng fcked it up pretty badly (the worst exhaust shop ever).

The brands you quoted are more towards Japanese cars and I'm not sure if they have a specific model for each car (very likely not?). However for continental cars, they always have a proper specific model for the car so obviously it's not a universal product like what Japanese brands normally do. In the case of continental cars, the companies that makes these performance exhausts are also the ones designing exhausts for BMW, Mercedes, Audi, VW, Porsche, etc. In terms of quality, they are also the top 5 in the world.

Therefore, it is very difficult to agree and come to a conclusion whereby a "custom" locally made exhaust could match a global exhaust company which have done proper R&D, testing, build quality, confirm their product works and generate the mentioned bhp/torque If the "custom" exhaust shops in Malaysia can do so well, they should be designing exhausts for Proton if not BMW, Mercedes, Audi, VW, Porsche.

Honestly, the main problem here is that most people are not willing to spend on proper products because it is too expensive.

To be honest, Japanese and continental cars are 2 different leagues If you consider TRD upgrade like those (for Vios, Camry) as a proper performance upgrade then I really scratch my head and have nothing else to say. You should see what "performance" upgrade really means by looking at what continental car tuners/manufacturers have to offer. Anyway, it's just how every individual perceive things and since I've owned a local, Japanese and Continental car myself (not adding other family cars which I have), I'm very clear of the differences. If we go back to the exhaust part, it's also undeniable that proper designed exhaust makes a different. The most important aspect is not only about the performance but the quality (Titanium, high grade stainless steel vs China crap stainless steel by local exhaust shops). When it's new you can't see or tell but along the way, it's very apparent.

If crap shops like Wai Heng exhaust is so good, they seriously should expand to the global market and multiply their profits substantially. The fact that they don't is because they cant - all they offer is a screw up exhaust replacement system which makes you lose torque and bhp without you knowing most of the time. I've tried it 3 times and I think it's enough.

This post has been edited by clawhammer: Mar 30 2012, 11:27 PM

That's the point I want to make Buying exhaust from a proper tuner would cost more but they are guaranteed to work. All these exhaust shops offering custom modification are most of the time nonsense (either they screw up something or everything).

I used to own a Proton Waja 4G18P back then. A few things which I did including changing the headers, removing the catalytic converter, replacing the rear muffler. To answer your questions:

1. should i change my piping size to any bigger?
If you change to a bigger piping size, you will very likely lose low end torque. The piping size is calculated based on your engine capacity and power produced.

2. y should i select straight bullet instead of spiral? what is the recommended inlet and outlet size for this?
If you're on an automatic transmission, S-flow designed muffler is recommended because you want some back pressure to retain torque and top speed

3. does the bullet's location affect the torque/hp?
It depends what type of bullet you are talking about

4. which muffler suit me best, as i'm looking for a deep bass sound (not too loud ofc)? does i have to find an exact inlet size as my piping as well?
If you go to Kedai Exhaust Ah Beng or Muthu, their mufflers are universal. It can fit all sorts of cars and you don't have to worry about the inlet/outlet because they will have a way to modify until it fits your car.

Btw, I'm not a graduate in automobile engineering but all these inputs are based on my experience Hope this helps.

Actually bro shinjite is an expert when it comes to cars He will be able to give a better answer. 1.6" is really good enough because even on my old Accord 2.4 K24A, the piping is around 1.7" if I'm not mistaken.

Yes boss, 2" is really a bit too big for that engine I suggest you stay away from Wai Heng, Xin Exhaust or any of their affiliates - all of them are UTTER CRAP!

I think you'd be better off with Everco Sunway or Supersprint (a bit expensive). Wai Heng uses crap mufflers and they just want to do your business so they can promise you all sorts of crap sh1t. Results wise might be not be what you'd like to have.

If you compare with stock muffler, it's definitely not a fair comparison because stock exhausts are normally designed for emission and a silent drive. Therefore it's always huge and big

From my experience, WAI HENG is really the WORST exhaust shop I've ever visited. If you would've told me, I can introduce you to some exhaust shops in Ampang which has locally made mufflers that has better quality compared to the crap that WAI HENG offered. It is also priced cheaper (from what I paid WAI HENG).

I agree with you that what we pay is what we get but paying for crap is really a waste of money. I went to WAI HENG 3 times in the case of my Accord and I really gave up on the 3rd time. After that I went to normal exhaust shop to replace the mufflers and piping (paid even a lower price) and that was even better because the sound level is more acceptable, my car dashboard doesn't vibrate like shit anymore and I get back my acceleration. There's really no point of me giving a negative remark about WAI HENG if not because they screw my car up for 3 times On my current ride I imported a proper tuned exhaust overseas so no complaints, haha.