Im having trouble getting a good comparison between HFC v. Test pipes v. Res Test pipes. Whats the difference ?

IMO from what I read im leaning toward Test Pipes. if someone could help compare Tomei test pipes and Berk Test pipes which once has the best gains/ sound.

 

test pipes are louder and will rasp anf throw a check engine light.
res tp will rasp less still as loud and check engine light.
hfc will rasp a tiny bit. Half as loud and 90 percent no check engine light.

as for power tp are all the same even tomei.
hfc maybe 1-2 less hp.

 

Thanks a lot for a reply. From what I’m learning (self taught) Berk’s Res Test pipes has CEL fixed & I’ll be getting an UpRev tune soon, so I pray I don’t get a CEL .

thanks a lot

 

cel fix may or may not work on the berks. Not long enough. Uprev i believe you cant turn off anymore due to software license problems. Not 100 percent sure. Vibrant performance sells a j bung elbow that will eliminate the cel im currently using them on my exoticspeed test pipes. Check amazon if you end up needing them

 

No CELs on my RTPs, but they use the Fast Intentions long port that goes against the flow.

 

Do test pipes leave soot on the bumper? I’m also looking to buy a set. I hate that deisel look.

 

Shouldn't leave any residue, at least in my case they haven't, although my car is black

 

I've got Z1 Testpipes and haven't got any CEL's

 

So it seems that everyone has FI res or non res test pipes. Why ? is there not any better test pipes besides Tomei & Berk ?

 

2 years on Berks, no CEL due to the HFC.

 

Mine are OBX, but they so closely resemble FIs that there may have been a patent issue, they are no longer in production.
https://www.myg37.com/forums/engine-...est-pipes.html

If you notice the O2 port, that FI style is what you want, they eliminate the CELs for straight pipes.

Like Mr Mer mentioned, HFCs are less likely to throw CELs since they have a catalyst.

 

A pipe is a pipe if you are skipping the cats. I have resonated Beluga TP's, added an o2 extender and haven't gotten a CEL yet, about 10k ago. I guarantee they perform within 1hp of the "name brands" and I'm very happy with them.

 

Test pipes = louder and raspier and smells like ***
HFC = quieter but throatier and smells like half an ***, maybe quarter ***

Both will leave oil soot on your bumper. TP more so than HFC

 

OP, I suggest taking a look at pictures of stock cats, hfc, art pipe, and straight pipes (test pipe). I think that will give you a lot better idea of what to expect from each product.

As for what sounds the best, that's very subjective. You need to make your own judgement based on your preference.

Look up some youtube videos. There are a lot of comparisons. If you can go to a local car meet; even better to hear it in person.

 

Im selling my motordyne ART pipes soon, LMK if you interested