noobie here,
interested in installing b-pipe with stock mufflers. did a quick search but to no avail. wanna keep the stock look because this will be my patrol vehicle . (can't be taggin ricers if i have a coffee can myself.) would this mod increase hp?...or just a waist of time due to the stock restricted mufflers? thanks

2003 CL3.2 Type S 6speeeed.
Comptech Springs
otherwise stock

 

probably not enough hp to notice a gain. stock exhaust flows really well.

 

i had the b-pipe with stock mufflers, gives it a more throaty sound.

 

You shouldn't do anything then. The B-pipe will increase your noise, & not give any gains.

 

Will the B-pipe provide any gains with the Comptech mufflers? I've run out of mods to do, haha. Unless of course I want to get nitrous or a supercharger.

 

i'd imagine not much, unfortunately for me, i just did comptech headers/cat-back exhaust at the same time, so i really can't say if the exhaust made any difference (besides the wonderful sound). From what i understand though, the only way to really get a gain from the exhaust is cat-back w/ b-pipe and that's maybe 1-2hp. The real gain with exhaust is when you do it w/ forced induction, but that's a big step (with a large price tag).

 

well, the b-pipe on the car is the most restrictive area, and it isn't all that restrictive, but in terms of cat-back, the b-pipe is the essential part.

IMO, header > hi-flow cat > b-pipe > any muffler of your choice. some will say otherwise in terms of the cat. stock it's pretty good, but if you went beyond a CAI on the intake side, you will see gains from a hi-flow cat.

 

ok,but who else besides comptech makes an aftermarket b-pipe? I just bent the crap out of mine and need a new one, so I just ordered a new stock pipe because from what i hear, the stock set up is compariable to many aftermarket set ups....

 

just the b-pipe, only comptech.

 

Here are some real numbers when I had Comtech do some testing on my CLS 6MT back in '03.

CT I/H/BP/E: 236 WHP, 201 FT-LBS TQ
+ CT SC: 305 WHP, 262 FT-LBS TQ
+ quiet inserts: 296 WHP, 256 FT-LBS TQ

Link to CT Dynos

Other CT testing showed that installing the CT BP added 2-3 WHP with CT I/H/E and 5-6 WHP with CT I/SC/H/E.

It's the sum of all mods; I/H/BP/E or I/SC/H/BP/E that makes the most of each individual mod.

Also, adding the CT BP will increase the interior noise level to something like a droning sound. Adding the CT quiet inserts to the CT exhaust will deaden most of the droning, but will kill any gains from the CT BP.

Further more, the CT exhaust does flow a little better than the OEM exhaust, making as much as 3-4 more WHP. So in conclusion, adding the CT BP with the OEM exhaust is a waste of time/money; unless you also plan to do CT I/SC/E as well.

 

That TQ # is lower from what it does stock. Is that a result of loosing too much back pressure?

 

Let's compare apples/apples. Unfortunately, I didn't get a baseline dyno at CT before modding. However, based on a number of other baseline dyno's I've seen in the past, stock CLS 6MT's have dyno'd as follows:

WHP: 215-221
WTQ: 191-197

I've dismissed the dyno numbers that are abnorally low or high. So I'm going with the average range that agree with the fact that there's typically between a 15-17% loss at the front wheels based on the stock numbers of: 260 HP/232 torque (lb-ft) at the crank.

So I would disagree that there was a loss in TQ, albeit only a small gain (4-10 WHP), normally aspirated.

Remember, dyno's results from different chassis dynamometer can vary greatly. The import numbers are the gains measured on a given dynamometer on a particular day and time (weather is a big factor too).

 

My 6MT did 206 TQ bone stock. I've seen others around the 205 mark as well. The 190's are for auto's. Done on a dyno jet.

 

Not to mention that many dyno's are out of spec. CT's dyno had been calibrated by the factory. In addition, CLS autos usually dyno'd with about 2-3% less than the MT's at CT.

 

You know what they say... dyno #s mean nothing unless they're used to compare before/after mods performance, on the same dyno, and with the same atmospheric conditions (if possible).

There's also a certain type of dyno that always typically rates lower results, I believe it's called a Mustang dyno (no pun intended, lol). My old CRX dyno'd at 170whp / 141lb-ft on a Mustang dyno yet it was a mid 13-sec car on street tires, go figure.

 

Then there are exceptions..

 

Then there are exceptions..

 

once again all my mods were dynoed before and after
stock 194.2 hp torque 185.7
224 hp torque 195.1 comptech headers,exhaust ---home made intake 10-23-01
227hp torque no-change v-tech 2-16-02
231.1 torque 195.6 3X pulleys unorthodox 8-26-02
237.1 torque 195.5 ice box comptech 7-3-03
241.1 torque 199.9 b-pipe 11-11-03
All work has been done at Garage Kwai Arl.hts Il. phone 1-847-259-6960 Ben Wong owner
Best time 14.10 @100.07 Mph Union Wisc.

 

Not worth the money unless you are boosted. Buy a Comptech Icebox instead.

 

mrsteve
I dont understad what you mean.

 

$400 for 4whp? Not worth it.

Spend $250 on an intake for 10whp

 

my dyno was done on a mustang dyno also 257/232

 

Or save up for some used CT Headers and keep your eye out.

 

I have a b-pipe on my TL-P and it gives me more mid-range power overall and better acceleration from 60-100mph

 

The dollar per hp ratio is low for the B-pipe. Not a good investment unless you desire more power from other mods, in that case you can use all it's potential.

 

I can't say for sure, but isn't the CL-P and TL-P OEM b-pipes smaller than the CL-S and TL-S b-pipes? If this is true, then upgrading to a CT b-pipe on P models may be worth the investment if there's significantly more hp gain.

But I do agree with what other's have said, for the Type-S models, unless you're going FI, don't waist your money on a CT b-pipe. Get a CAI instead.

 

I have the b-pipe on my '02 TL-S with stock mufflers. Can't tell any diference as far as power is concerned. The exhaust has a little deeper tone and not the drone as other have mentioned. I had the Comptech exhaust as well, but it was too loud for my taste so I sold them. I picked up my b-pipe used for $250. I couldn't justify paying the price of a new pipe.

I had run out of mods so this was my last bolt on mod.